Author Question: Use the data from Exhibit 6-2. If the national mean is 25, and the standard deviation is 8, who has ... (Read 57 times)

dmcintosh · **on:** Jul 30, 2018

Use the data from Exhibit 6-2. If the national mean is 25, and the standard deviation is 8, who has done better: the graduate program or the national group?

What will be an ideal response?

Question 2

Using the information in Exhibit 6-2, if you want to end up with six bars on your histogram, how many numbers should be in each interval?

What will be an ideal response?

Andromeda18 · **Reply #1 on:** Jul 30, 2018

Answer to Question 1

ANSWER: This is a complex question. Although the national mean is higher, so is the variability. Thus, the range of scores around the mean is larger for the national group and actually dips into the lower end of the local group. In essence, the groups of scores overlap one another. Thus, it is not clear that one group has actually done better than another. If one's mean and standard deviation were both clearly higher for one of the groups, one could say that group has done better. That is not the case with these groups of scores.

Answer to Question 2

ANSWER: 4
How to figure problem: (33 12)/6 = 3.5 (rounded off to 4)