Collaborative Statistics 1st edition

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Barbara Illowsky and Susan Dean
Publisher: Open Educational Resources

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  • Chapter 1: Sampling and Data
    • 1.1: Sampling and Data
    • 1.2: Statistics
    • 1.3: Probability
    • 1.4: Key Terms
    • 1.5: Data
    • 1.6: Sampling
    • 1.7: Variation
    • 1.8: Answers and Rounding Off
    • 1.9: Frequency
    • 1.10: Summary
    • 1.11: Practice: Sampling and Data
    • 1.12: Homework (62)
    • 1.13: Lab 1: Data Collection
    • 1.14: Lab 2: Sampling Experiment
    • 1.15: Extra Problems (6)

  • Chapter 2: Descriptive Statistics
    • 2.1: Descriptive Statistics
    • 2.2: Displaying Data
    • 2.3: Stem and Leaf Graphs (Stemplots)
    • 2.4: Histograms
    • 2.5: Box Plots
    • 2.6: Measures of the Location of the Data
    • 2.7: Measures of the Center of the Data
    • 2.8: Skewness and the Mean, Median, and Mode
    • 2.9: Measures of the Spread of the Data
    • 2.10: Summary of Formulas
    • 2.11: Practice 1: Center of the Data
    • 2.12: Practice 2: Spread of the Data
    • 2.13: Homework (101)
    • 2.14: Lab: Descriptive Statistics (1)
    • 2.15: Extra Problems (7)

  • Chapter 3: Probability Topics
    • 3.1: Probability Topics
    • 3.2: Terminology
    • 3.3: Independent and Mutually Exclusive Events
    • 3.4: Two Basic Rules of Probability
    • 3.5: Contingency Tables
    • 3.6: Venn Diagrams (optional)
    • 3.7: Tree Diagrams (optional)
    • 3.8: Summary of Formulas
    • 3.9: Practice 1: Contingency Tables
    • 3.10: Practice 2: Calculating Probabilities
    • 3.11: Homework (116)
    • 3.12: Review
    • 3.13: Lab: Probability Topics (1)
    • 3.14: Extra Problems (42)

  • Chapter 4: Discrete Random Variables
    • 4.1: Discrete Random Variables
    • 4.2: Probability Distribution Function (PDF) for a Discrete Random Variable
    • 4.3: Mean or Expected Value and Standard Deviation
    • 4.4: Common Discrete Probability Distribution Functions
    • 4.5: Binomial
    • 4.6: Geometric (optional)
    • 4.7: Hypergeometric (optional)
    • 4.8: Poisson
    • 4.9: Summary of Functions
    • 4.10: Practice 1: Discrete Distribution
    • 4.11: Practice 2: Binomial Distribution
    • 4.12: Practice 3: Poisson Distribution
    • 4.13: Practice 4: Geometric Distribution
    • 4.14: Practice 5: Hypergeometric Distribution
    • 4.15: Homework (169)
    • 4.16: Review
    • 4.17: Lab 1: Discrete Distribution (Playing Card Experiment) (1)
    • 4.18: Lab 2: Discrete Distribution (Lucky Dice Experiment)
    • 4.19: Extra Problems (19)

  • Chapter 5: Continuous Random Variables
    • 5.1: Continuous Random Variables
    • 5.2: Continuous Probability Functions
    • 5.3: The Uniform Distribution
    • 5.4: The Exponential Distribution
    • 5.5: Summary of the Uniform and Exponential Probability Distributions
    • 5.6: Practice 1: Uniform Distribution
    • 5.7: Practice 2: Exponential Distribution
    • 5.8: Homework (104)
    • 5.9: Review
    • 5.10: Lab: Continuous Distribution

  • Chapter 6: The Normal Distribution
    • 6.1: The Normal Distribution
    • 6.2: The Standard Normal Distribution
    • 6.3: Z-Scores
    • 6.4: Areas to the Left and Right of x
    • 6.5: Calculations of Probabilities
    • 6.6: Summary of Formulas
    • 6.7: Practice: The Normal Distribution
    • 6.8: Homework (61)
    • 6.9: Review
    • 6.10: Lab 1: Normal Distribution (Lap Times)
    • 6.11: Lab 2: Normal Distribution (Pinkie Length) (1)

  • Chapter 7: The Central Limit Theorem
    • 7.1: The Central Limit Theorem
    • 7.2: The Central Limit Theorem for Sample Means (Averages)
    • 7.3: The Central Limit Theorem for Sums
    • 7.4: Using the Central Limit Theorem
    • 7.5: Summary of Formulas
    • 7.6: Practice: The Central Limit Theorem
    • 7.7: Homework (89)
    • 7.8: Review
    • 7.9: Lab 1: Central Limit Theorem (Pocket Change)
    • 7.10: Lab 2: Central Limit Theorem (Cookie Recipes)
    • 7: Extra Problems

  • Chapter 8: Confidence Intervals
    • 8.1: Confidence Intervals
    • 8.2: Confidence Interval, Single Population Mean, Population Standard Deviation Known, Normal
    • 8.3: Confidence Interval, Single population mean, Standard Deviation Unknown, Student-T
    • 8.4: Confidence Interval for a Population Proportion
    • 8.5: Summary of Formulas
    • 8.6: Practice 1: Confidence Intervals for Averages, Known Population Standard Deviation
    • 8.7: Practice 2: Confidence Intervals for Averages, Unknown Population Standard Deviation
    • 8.8: Practice 3: Confidence Intervals for Proportions
    • 8.9: Homework (117)
    • 8.10: Review
    • 8.11: Lab 1: Confidence Interval (Home Costs)
    • 8.12: Lab 2: Confidence Interval (Place of Birth) (1)
    • 8.13: Lab 3: Confidence Interval (Women's Heights)

  • Chapter 9: Hypothesis Testing: Single Mean and Single Proportion
    • 9.1: Hypothesis Testing: Single Mean and Single Proportion
    • 9.2: Null and Alternate Hypotheses
    • 9.3: Outcomes and the Type I and Type II Errors
    • 9.4: Distribution Needed for Hypothesis Testing
    • 9.5: Assumption
    • 9.6: Rare Events
    • 9.7: Using the Sample to Support One of the Hypotheses
    • 9.8: Decision and Conclusion
    • 9.9: Additional Information
    • 9.10: Summary of the Hypothesis Test
    • 9.11: Examples
    • 9.12: Summary of Formulas
    • 9.13: Practice 1: Single Mean, Known Population Standard Deviation
    • 9.14: Practice 2: Single Mean, Unknown Population Standard Deviation
    • 9.15: Practice 3: Single Proportion
    • 9.16: Homework (212)
    • 9.17: Review
    • 9.18: Lab: Hypothesis Testing of a Single Mean and Single Proportion

  • Chapter 10: Hypothesis Testing: Two Means, Paired Data, Two Proportions
    • 10.1: Hypothesis Testing: Two Population Means and Two Population Proportions
    • 10.2: Comparing Two Independent Population Means with Unknown Population Standard Deviations
    • 10.3: Comparing Two Independent Population Means with Known Population Standard Deviations
    • 10.4: Comparing Two Independent Population Proportions
    • 10.5: Matched or Paired Samples
    • 10.6: Summary of Types of Hypothesis Tests
    • 10.7: Practice 1: Hypothesis Testing for Two Proportions
    • 10.8: Practice 2: Hypothesis Testing for Two Averages
    • 10.9: Homework (217)
    • 10.10: Review
    • 10.11: Lab: Hypothesis Testing for Two Means and Two Proportions

  • Chapter 11: The Chi-Square Distribution
    • 11.1: The Chi-Square Distribution
    • 11.2: Notation
    • 11.3: Facts About the Chi-Square Distribution
    • 11.4: Goodness-of-Fit Test
    • 11.5: Test of Independence
    • 11.6: Test of a Single Variance (optional)
    • 11.7: Summary of Formulas
    • 11.8: Practice 1: Goodness-of-Fit Test
    • 11.9: Practice 2: Contingency Tables
    • 11.10: Practice 3: Test of a Single Variance
    • 11.11: Homework (198)
    • 11.12: Review
    • 11.13: Lab 1: Chi-Square Goodness-of-Fit
    • 11.14: Lab 2: Chi-Square Test for Independence

  • Chapter 12: Linear Regression and Correlation
    • 12.1: Linear Regression and Correlation
    • 12.2: Linear Equations
    • 12.3: Slope and Y-Intercept of a Linear Equation
    • 12.4: Scatter Plots
    • 12.5: The Regression Equation
    • 12.6: The Correlation Coefficient
    • 12.7: Facts About the Correlation Coefficient for Linear Regression
    • 12.8: Prediction
    • 12.9: Outliers
    • 12.10: 95% Critical Values of the Sample Correlation Coefficient Table
    • 12.11: Summary
    • 12.12: Practice: Linear Regression
    • 12.13: Homework (107)
    • 12.14: Lab 1: Regression (Distance from School)
    • 12.15: Lab 2: Regression (Textbook Cost)
    • 12.16: Lab 3: Regression (Fuel Efficiency)
    • 12.17: Extra Problems (12)

  • Chapter 13: F Distribution and ANOVA
    • 13.1: F Distribution and ANOVA
    • 13.2: ANOVA
    • 13.3: The F Distribution and the F Ratio
    • 13.4: Facts About the F Distribution
    • 13.5: Test of Two Variances
    • 13.6: Summary
    • 13.7: Practice: ANOVA
    • 13.8: Homework (61)
    • 13.9: Review
    • 13.10: Lab: ANOVA

WebAssign, the independent online homework and assessment solution, is proud to announce a new partnership with the open source teaching community. Collaborative Statistics, authored by Barbara Illowsky and Susan Dean of De Anza College, and available through the Connexions and Orange Grove Texts Plus open source content repositories, is now supported by homework questions and student learning resources within WebAssign.

WebAssign Content for the Collaborative Statistics project includes:

  • Approximately two thirds of the Homework problems from the text
  • Several Labs from representative text chapters
  • Applicable sections of the text linked to individual questions
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Most questions from this textbook are available in WebAssign. The online questions are identical to the textbook questions except for minor wording changes necessary for Web use. Whenever possible, variables, numbers, or words have been randomized so that each student receives a unique version of the question. This list is updated nightly.

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HW - Homework Section
Lab - Lab Section
general - Generalized Textbook Question
XP - Extra Problems Not in the Textbook
alt - Alternate version of the Question


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BLACK questions are available now
GRAY questions are under development


Group Quantity Questions
Chapter 1: Sampling and Data
1.HW 62 002 002a 002b 002c 003 003a 003b 003c 004 004a 004b 004c 004d 004e 004f 005 005a 005b 005c 005d 005e 005f 006 006a 006b 006c 006d 006e 006f 008 008a 008b 008c 008d 008e 008f 012 012a 012b 015 015a 015b 015c 015d 016 016a 016abc 016ad 016ae 016af 016ag 019 020 021 022 023 023.general 024 024.general 025 026 027
1.XP 6 001 001a 001b 001c 001d 001e
Chapter 2: Descriptive Statistics
2.HW 101 001 001a 001b 001c 001d 001e 001f 001g 001h 001i 001j 001k 003 003a 003b 003c 003d 003e 003f 003g 003h 003i 003j 003k 005 005.general 005.general.alt 005a 005a.general 005b 005b.general 005c 005c.general 005d 005d.general 005e 005e.general 005f 005f.general 005g 005g.general 005h 005h.general 005i 005i.general 008 008a 008b 008c 008d 010 010a 010b 010c 010d 010e 014 014a 014b 014c 014d 014e 014f 014g 014h 015 015a 015b 015c 015d 016 016a 016b 017 017a 017b 017c 017d 017e 017f 017g 017h 017i 017j 017k 018 018a 018b 018c 018d 018e 018f 021 021a 021b 023 023a 023b 027 028 029
2.Lab 1 001
2.XP 7 001 002 002a 002b 002c 002d 002g
Chapter 3: Probability Topics
3.HW 116 001 001a 001b 001c 001d 001e 001f 002 002a 002b 002c 002d 002e 003 003a 003b 003c 003d 003e 004 004a 004b 004c 004d 004e 004f 007 007a 007b 007c 008 008a 008b 008c 008d 010 011 011a 011b 011c 012 014 014a 014b 014c 017 017a 017b 017c 017d 017e 017f 017g 018 018a 018b 018c 018d 018e 018f 019 019.general 019a.general 019b.general 019c.general 019d.general 020 020.general 020a.general 020b.general 020c.general 020d.general 020e.general 021 021.general 021a 021a.general 021abc 021abc.general 021b 021b.general 021bd 021bd.general 022 022.general 022a.general 022b.general 022c.general 022d.general 022e.general 024 024.general 024.general.alt 024a 024a.general 024b 024b.general 024c 024c.general 024cde 024cde.general 024d 024d.general 024f 024f.general 024g 024g.general 025 025.general 025a.general 025b.general 025c.general 028 029 030 031
3.Lab 1 001
3.XP 42 001 001a 001b 001c 002 002a 002b 002c 003 003a 003b 004 004a 004b 005 005a 005b 006 006a 006b 006c 006d 006e 007 007a 007b 007c 007d 007e 007f 008 008a 008b 008c 008d 008e 008f 009 009a 009b 009c 009d
Chapter 4: Discrete Random Variables
4.HW 169 001 001a 001b 002 002a 002b 002c 002d 002e 002f 003 003a 003b 003c 003d 003e 004 004a 004b 004c 004d 004e 006 006a 006b 006c 007 007a 007b 007c 007d 007e 007f 008 008a 008b 008c 008d 008e 008f 009 009a 009b 009c 009d 009e 009f 010 010a 010b 010c 010d 010e 010f 011 011a 011b 011c 011d 011e 011f 012 012a 012b 012c 012d 012e 012f 014 014a 014b 014c 014d 014e 014f 015 015a 015b 015c 015d 015e 015f 016 016a 016b 016c 016d 016e 016f 018 018a 018b 018c 018d 018e 018f 019 019a 019b 019c 019d 019e 019f 020 020a 020b 020c 020d 020e 020f 021 021a 021b 021c 021d 021e 021f 022 022a 022b 022c 022d 022e 022f 023 023a 023b 023c 023d 023e 023f 024 024a 024b 024c 024d 024e 024f 026 026a 026b 026c 026d 026e 026f 027 027a 027b 027c 027d 027e 027f 027g 028 028a 028b 028c 028d 028e 028f 028g 033 033.general 034 034.general 035 035.general 036 037
4.Lab 1 001
4.XP 19 001 001a 001b 001c 001d 001e 001f 001g 002 003 004 005 006 006a 006b 006c 006d 006e 006f
Chapter 5: Continuous Random Variables
5.HW 104 004 004a 004b 004c 004d 004e 004f 004g 004h 004i 005 005a 005b 005c 005d 005e 005f 005g 005h 005i 005j 005k 005l 006 006a 006b 006c 006d 006e 006f 006g 006h 006i 007 007a 007b 007c 007d 007e 007f 007g 007h 007i 008 008a 008b 008c 008d 008e 008f 008g 008h 008i 009 009a 009b 009c 009d 009e 009f 009g 009h 010 010a 010b 010c 010d 010e 010f 010g 010h 010i 010j 011 011a 011b 011c 011d 011e 011f 011g 013 013a 013b 013c 013d 013e 013f 013g 013h 013i 014 014a 014b 014c 014d 014e 014f 015 016 017 018 019 020
Chapter 6: The Normal Distribution
6.HW 61 002 002a 002b 002c 002d 004 004a 004b 004c 005 005.general 005a 005a.general 005b 005b.general 005c 005c.general 005d 005d.general 005e 005e.general 007 007a 007b 007c 007d 008 008a 008b 008c 008d 008e 009 009a 009b 009bc 009d 009de 009f 011 011.general 011a 011a.general 011b 011b.general 011bc 011bc.general 011d 011d.general 011de 011de.general 011f 011f.general 012 013 014 015 016 017 018 019
6.Lab 1 002
Chapter 7: The Central Limit Theorem
7.HW 89 001 001a 001b 001c 001d 001e 001f 001g 001h 001i 004 004a 004b 004c 004d 004e 004f 004g 005 005a 005b 005c 006 006a 006b 006c 006d 006e 006f 006g 006h 007 007.alt 007a 007b 007c 007d 009 009a 009b 009c 009d 010 010a 010b 010c 010d 010e 010f 010g 011 011.alt 011a 011b 011c 011d 011e 011f 011g 011h 011i 011j 011k 013 013.alt 013a 013b 013c 013d 013e 013f 013g 013h 013i 013j 015 015a 015b 015c 015d 015e 015f 015g 015h 015i 016 021 022 023
Chapter 8: Confidence Intervals
8.HW 117 006 006a 006b 006c 006d 006e 006f 006g 007 007a 007b 007c 007d 007e 007f 007g 007h 008 008a 008b 008c 008d 008e 008f 010 010a 010b 011 011a 011b 011c 011d 011e 012 012a 012b 012c 012d 013 013a 013b 013c 014 014a 014b 014c 014d 014e 015 015.general 015a 015a.general 015b 015b.general 015c 015c.general 016 016.general 016a 016a.general 016b 016b.general 016c 016c.general 016d 016d.general 018 018.general 018a 018a.general 018b 018b.general 018c 018c.general 018d 018d.general 019 019a 019b 019c 019d 020 020.general 020a 020a.general 020b 020b.general 020c 020c.general 020d 020d.general 020e 020e.general 021 021.general 021a 021a.general 021b 021b.general 021c 021c.general 021d 021d.general 022 022a 022b 024 024.general 025 025.general 026 026.general 027 028 029 030 031
8.Lab 1 002
Chapter 9: Hypothesis Testing: Single Mean and Single Proportion
9.HW 212 001 001a 001b 001c 001d 001e 001f 001g 001h 001i 001j 002a 002b 002c 002d 002e 002f 002g 002h 002i 002j 004 004a 004b 004c 004d 004e 004f 004g 004h 004i 005 005a 005b 005c 005d 005e 005f 005g 005h 005i 006 006a 006b 006c 006d 006e 006f 006g 006h 006i 007 007a 007b 007c 007d 007e 007f 007g 007h 007i 008 008a 008b 008c 008d 008e 008f 008g 008h 008i 009 009a 009b 009c 009d 009e 009f 009g 009h 009i 013 013a 013b 013c 013d 013e 013f 013g 013h 013i 015 015a 015b 015c 015d 015e 015f 015g 015h 015i 016 016a 016b 016c 016d 016e 016f 016g 016h 016i 024 024.general 024a 024a.general 024b 024b.general 024c 024c.general 024d 024d.general 024e 024e.general 024f 024f.general 024g 024g.general 024h 024h.general 024i 024i.general 028 028a 028b 028c 028d 028e 028f 028g 028h 028i 029 029.general 029a 029a.general 029b 029b.general 029c 029c.general 029d 029d.general 029e 029e.general 029f 029f.general 029g 029g.general 029h 029h.general 029i 029i.general 030 030a 030b 030c 030d 030e 030f 030g 030h 030i 031 031a 031b 031c 031d 031e 031f 031g 031h 031i 032 032.general 032a 032a.general 032b 032b.general 032c 032c.general 032d 032d.general 032e 032e.general 032f 032f.general 032g 032g.general 032h 032h.general 032i 032i.general 034 035 036 037 038 039 040 041 042 043 044
Chapter 10: Hypothesis Testing: Two Means, Paired Data, Two Proportions
10.HW 217 001 003 004 005 006 007 008 009 011 011a 011b 011c 011d 011e 011f 011g 011h 011i 013 013a 013b 013c 013d 013e 013f 013g 013h 013i 014 014a 014b 014c 014d 014e 014f 014g 014h 014i 015 015a 015b 015c 015d 015e 015f 015g 015h 015i 016 016.general 016a 016a.general 016b 016b.general 016c 016c.general 016d 016d.general 016e 016e.general 016f 016f.general 016g 016g.general 016h 016h.general 016i 016i.general 017 017.general 017a 017a.general 017b 017b.general 017c 017c.general 017d 017d.general 017e 017e.general 017f 017f.general 017g 017g.general 017h 017h.general 017i 017i.general 019 019a 019b 019c 019d 019e 019f 019g 019h 019i 021 021a 021b 021c 021d 021e 021f 021g 021h 021i 022 022a 022b 022c 022d 022e 022f 022g 022h 022i 023 023a 023b 023c 023d 023e 023f 023g 023h 023i 025 025a 025b 025c 025d 025e 025f 025g 025h 025i 026 026a 026b 026c 026d 026e 026f 026g 026h 026i 027 027a 027b 027c 027d 027e 027f 027g 027h 027i 028 028.general 028a 028a.general 028b 028b.general 028c 028c.general 028d 028d.general 028e 028e.general 028f 028f.general 028g 028g.general 028h 028h.general 028i 028i.general 029 029a 029b 029c 029d 029e 029f 029g 029h 029i 030 030a 030b 030c 030d 030e 030f 030g 030h 030i 032 032a 032b 032c 032d 032e 032f 032g 032h 032i 039 040 042 043 046 047 048 051 052
Chapter 11: The Chi-Square Distribution
11.HW 198 002 002a 002b 002c 002d 002e 002f 002g 002h 003 003a 003b 003c 003d 003e 003f 003g 003h 006 006.general 006a 006a.general 006b 006b.general 006c 006c.general 006d 006d.general 006e 006e.general 006f 006f.general 006g 006g.general 006h 006h.general 007 007.general 007a 007a.general 007b 007b.general 007c 007c.general 007d 007d.general 007e 007e.general 007f 007f.general 007g 007g.general 007h 007h.general 008 008.general 008a 008a.general 008b 008b.general 008c 008c.general 008d 008d.general 008e 008e.general 008f 008f.general 008g 008g.general 008h 008h.general 010 010a 010b 010c 010d 010e 010f 010g 010h 011 011a 011b 011c 011d 011e 011f 011g 011h 012 012a 012b 012c 012d 012e 012f 012g 012h 013 013a 013b 013c 013d 013e 013f 013g 013h 015 015.general 015a 015a.general 015b 015b.general 015c 015c.general 015d 015d.general 015e 015e.general 015f 015f.general 015g 015g.general 015h 015h.general 016 016a 016b 016c 016d 016e 016f 016g 016h 017 017a 017b 017c 017d 017e 017f 017g 017h 018 018a 018b 018c 018d 018e 018f 018g 018h 019 019a 019b 019c 019d 019e 019f 019g 019h 020 020a 020b 020c 020d 020e 020f 020g 020h 021 021a 021b 021c 021d 021e 021f 021g 021h 022 022a 022b 022c 022d 022e 022f 022g 022h 023 023a 023b 023c 023d 023e 023f 023g 023h
Chapter 12: Linear Regression and Correlation
12.HW 107 002 002.general 002ab 002ab.general 002c 002c.general 002ce 002ce.general 002d 002d.general 002h 002h.general 003 003a 003b 003bd 003bg 003bi 003c 003j 005 005.general 005ab 005ab.general 005c 005c.general 005ce 005ce.general 005ci 005ci.general 005d 005d.general 005j 005j.general 005k 005k.general 009 009ab 009c 009ce 009cf 009d 009k 010 011 011.general 011abc 011abc.general 011d 011d.general 011df 011df.general 011e 011e.general 011h 011h.general 011j 011j.general 011k 011k.general 012 012abc 012d 012df 012e 012j 013 013abc 013d 013df 013dj 013e 013k 014 014abc 014d 014df 014dj 014e 018 018a 018b 018c 018d 018e 018f 019 019a 019b 019bd 019be 019bf 019c 020 020a 020b 020bd 020be 020bf 020c 022 023 023.general 024 024.general 025 025.general
12.XP 12 001 001a 001b 001c 001d 001e 001f 001g 001h 001i 001j 002
Chapter 13: F Distribution and ANOVA
13.HW 61 001 001a 001b 001c 001d 001e 001f 001g 001h 001i 002 002a 002b 002c 002d 002e 002f 002g 002h 002i 003 003a 003b 003c 003d 003e 003f 003g 003h 003i 004 005 005a 005b 005c 005d 005e 005f 005g 005h 005i 007 007a 007b 007c 007d 007e 007f 007g 007h 007i 008 008a 008b 008c 008d 008e 008f 008g 008h 008i
Total 1705