Write down the null and alternate hypotheses you would use to test the following situations. Define your parameter of interest first. (2 x 5 = 10)
(a) In the 1950's, only about 40% of high school graduates went to college. Has the percentage changed?
(b) Is a coin fair?
(c) In recent years, 10% of college juniors have applied for study abroad. The Dean's office wants to see if the percentage has increased this year.
(d) The mean hospital bill for a birth in the city is less than $5000.
(e) The mean time a health insurance company takes to pay claims is less than 10 working days.