Let’s revisit Example 4.1 from Chapter 4, which involved constructing the 95% CI for the mean CFI complacency score based on the data given in the file Ch_4 CFI Complacency

Scores. Recall from Example 4.1 that we assumed σ = 5, and that the population complacency scores were normally distributed in the population. Replicate Example 4.1, but now assume that σ is unknown.

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= .025 t(44)=-2.015 Figure 5.3 Illustration of a two-tailed t test for Example 5.2. = .025 t(44) 2.015