(u) (T or F) We need to assume row and column sums are fixed to run a Fisher exact test.
2. [27 POINTS] Suppose you want to know if the average time it takes to complete a certain
task is significantly different from a target time of 30 minutes. You randomly select a sample
of 20 participants and time how long it takes them to complete the task. The data is as
follows:
26, 29, 31, 33, 27, 28, 30, 31, 32, 29, 25, 28, 34, 30, 31, 27, 29, 33, 28, 30
(a) (6 pts) What assumptions you need to compute a t confidence interval? Can you built
a z confidence interval, Explain your answer?
Values measure in ratio scale or interval scale,
Simple random, appropriate site, and variance
(b) (3pts) Provide a point estimate.