Discussion of Quiz #3

Complete discussion of Chi-squared tests

Confidence intervals for a population mean - see handout

Relationship between normal and t-distributions

In class exercises

  1. Complete Example 4 on the hypothesis testing handout (spectrophotometer data) using RStudio and without assuming that the standard deviation is known. See Spectro.R
  2. Textbook exercises - 7.1, 7.3, and 7.11. Tip: use use the RStudio commands qt and pt to find the quantiles and probability for a t distribution with (n-1) degrees of freedom. You may also use the pdist("t", value, df) command to illustrate the probability calculations.

Please read Section 7.2 for class on Wednesday.