Author Question: Which of the following statements concerning areas under the standard normal curve is/are true? ... (Read 59 times)

nenivikky · **on:** Jul 25, 2018

Which of the following statements concerning areas under the standard normal curve is/are true?

a. If a z-score is negative, the area to its right is greater than 0.5
b. If the area to the right of a z-score is less than 0.5, the z-score is negative.
c. If a z-score is positive, the area to its left is less than 0.5
A) a, b B) b, c C) a, c D) a

Question 2

A pharmaceutical testing company wants to test a new cholesterol drug. The average cholesterol of the target population is 200 mg and they have a standard deviation of 25 mg.

The company wished to test a sample of people who fall between 1.5 and 3 z-scores above the mean. Into what range must a candidate's cholesterol level be in order for the candidate to be included in the study?
A) 162.5 - 275 B) 225 - 237.5 C) 237.5 - 275 D) 125 - 162.5