Author Question: In a survey of n = 100 teachers, 50 preferred year-around school. Set the .95 confidence interval ... (Read 32 times)

leilurhhh · **on:** Jun 20, 2018

In a survey of n = 100 teachers, 50 preferred year-around school. Set the .95 confidence interval around this sample proportion.

a. .40 to .60
c. .50 to .60
b. .45 to .55
d. .55 to .65

Question 2

A university surveyed 36 randomly selected graduate students in a pilot study and found that 27 said they favored the new university health insurance plan and 9 said they opposed it. How many students must the university survey in order to make an estimate of how all graduate students feel about the plan with a margin of error to be no more than 5 percentage points? Use the 95 percent confidence level.

a. 187
c. 366
b. 288
d. 950