Statistics Notes

Math 121 - Fall 2026

Jump to: Math 121 homepage, Week 1, Week 2, Week 3, Week 4, Week 5, Week 6, Week 7, Week 8, Week 9, Week 10, Week 11, Week 12, Week 13, Week 14, Week 15

Week 1 Notes

Day Section Topic
Mon, Aug 24 1.2 Data tables, variables, and individuals
Wed, Aug 26 2.1.3 Histograms & skew
Fri, Aug 28 2.1.5 Boxplots

Week 2 Notes

Day Section Topic
Mon, Aug 31 2.1.4 Standard deviation
Wed, Sep 2 4.1 Normal distribution
Fri, Sep 4 4.1.4 Normal distribution computations

Week 3 Notes

Day Section Topic
Mon, Sep 7 No class (Labor day)
Wed, Sep 9 2.1, 8.1 Scatterplots and correlation
Fri, Sep 11 8.2 Least squares regression introduction

Week 4 Notes

Day Section Topic
Mon, Sep 14 8.2 Least squares regression practice
Wed, Sep 16 1.3 Sampling: populations and samples
Fri, Sep 18 1.3 Bias versus random error

Week 5 Notes

Day Section Topic
Mon, Sep 21 1.4 Randomized controlled experiments
Wed, Sep 23 Review
Fri, Sep 25 Midterm 1

Week 6 Notes

Day Section Topic
Mon, Sep 28 3.1 Defining probability
Wed, Sep 30 3.1 Multiplication and addition rules
Fri, Oct 2 3.4 Weighted averages & expected value

Week 7 Notes

Day Section Topic
Mon, Oct 5 3.4 Random variables
Wed, Oct 7 7.1 Sampling distributions
Fri, Oct 9 5.1 Sampling distributions for proportions

Week 8 Notes

Day Section Topic
Mon, Oct 12 No class (Fall break)
Wed, Oct 14 5.2 Confidence intervals for a proportion
Fri, Oct 16 5.2 Confidence intervals for a proportion - con’d

Week 9 Notes

Day Section Topic
Mon, Oct 19 5.3 Hypothesis testing for a proportion
Wed, Oct 21 Review
Fri, Oct 23 Midterm 2

Week 10 Notes

Day Section Topic
Mon, Oct 26 6.1 Inference for a single proportion
Wed, Oct 28 5.3.3 Decision errors
Fri, Oct 30 6.2 Difference of two proportions (hypothesis tests)

Week 11 Notes

Day Section Topic
Mon, Nov 2 6.2.3 Difference of two proportions (confidence intervals)
Wed, Nov 4 7.1 Introducing the t-distribution
Fri, Nov 6 7.1.4 One sample t-confidence intervals

Week 12 Notes

Day Section Topic
Mon, Nov 9 7.2 Paired data
Wed, Nov 11 7.3 Difference of two means
Fri, Nov 13 7.3 Difference of two means - con’d

Week 13 Notes

Day Section Topic
Mon, Nov 16 Choosing the right technique
Wed, Nov 18 Review
Fri, Nov 20 Midterm 3

Week 14 Notes

Day Section Topic
Mon, Nov 23 7.4 Statistical power
Wed, Nov 25 No class (Thanksgiving break)
Fri, Nov 27 No class (Thanksgiving break)

Week 15 Notes

Day Section Topic
Mon, Nov 30 6.3 Chi-squared statistic
Wed, Dec 2 6.4 Testing association with chi-squared
Fri, Dec 4 Chi-squared caveats
Mon, Dec 7 Last day, recap & review