Author Question: Heights of college women have a distribution that can be approximated by a normal curve with a mean ... (Read 52 times)

Capo · **on:** Jul 24, 2018

Heights of college women have a distribution that can be approximated by a normal curve with a mean of 65 inches and a standard deviation equal to 3 inches. About what proportion of college women are between 65 and 67 inches tall?
a. 0.75
b. 0.50
c. 0.25
d. 0.17

Question 2

A CBS News poll taken in January 2010 asked a random sample of 1,090 adults in the US Do you think the federal government is adequately prepared to deal with a major earthquake in the United States, or not? A 95 confidence interval for the proportion of the population that thinks the government is prepared is .31 to .37 . Based on this result, which one of the following statements is false?
a. It is reasonable to say that a majority of adults in the US think the federal government is prepared to deal with a major earthquake.
b. It is reasonable to say that fewer than half of adults in the US think the federal government is prepared to deal with a major earthquake.
c. It is possible that approximately 35 of adults in the US think the federal government is prepared to deal with a major earthquake.
d. A 99 confidence interval for the proportion of the population that thinks the government is prepared would be wider than the 95 confidence interval given above.