Chapter 13, Problem 33E

a)

To determine

To explain the meaning of statistically significant results.

Answer to Problem 33E

The differences among the Mozart and quiet groups were more than would have been expected from sampling variation.

Explanation of Solution

The meaning of "Significant differences" is that the differences in the scores are too large to be due to chance. Therefore, the differences among the Mozart and quiet groups were more than would have been expected from sampling variation.

b)

To determine

To construct a diagram of design of experiment.

Explanation of Solution

c)

To determine

To explain whether the Mozart having some improvement.

Answer to Problem 33E

There is least improvement.

Explanation of Solution

Given:

The Mozart group seems to have the smallest median difference in spatial reasoning test score. Therefore, there is least improvement in Mozart treatment but there does not have significant difference.

d)

To determine

To explain whether the results prove that listening to Mozart is beneficial.

Answer to Problem 33E

No.

Explanation of Solution

Given:

There is least improvement in Mozart treatment but there does not have significant difference. Therefore, there are no significant differences nor improvements between the groups.