What is the difference between a z-test and a 1-sample t-test?
What is the difference between a z-test and a 1-sample t-test?
2. What is the relationship between a chosen level of confidence for a confidence
interval and how wide that interval is? For instance, if you move from a 95% CI to a
90% CI, what happens? Hint: look at the t-table to see how critical values change when
you change levels of significance.
3. You are curious about how people feel about craft beer, so you gather data from 55
people in the city on whether or not they like it. You code your data so that 0 is neutral, positive scores indicate liking craft beer, and negative scores indicate disliking craft
beer. You find that the average opinion was X = 1.10 and the spread was s = 0.40, and
you test for a difference from 0 at the α = 0.05 level.
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