Part 1 : Please select the best option to complete or to answer the following items (2 pts. each -40 points total).

1.

The decision to retain the null hypothesis is __________ the decision to reject the null hypothesis.

A)

weaker than

B)

unrelated to

C)

stronger than

D)

as strong as

2.

Prior to attending college, randomly selected college-bound students participate in a summer workshop on the development of good study habits. Subsequently, at the end of their first year in college, they showed a dramatic increase in grade point averages, relative to the national average of 2.75, as revealed by a 95 percent confidence interval of 2.90 to 3.30. This confidence interval signifies that

A)

we can be reasonably confident that the true population mean (for all students who could conceivably take the summer workshop) is between 2.90 and 3.30.

B)

the true population mean (for all students who could conceivably take the summer workshop) is between 2.90 and 3.30.

C)

every student who participated in the summer workshop hada GPA between 2.90 and 3.30.

D)

about 95 percent of all students who participated in the summer workshop had GPAs between 2.90 and 3.30.

3.

Specify which one of the following 95 percent confidence intervals would be most preferable, given that you wish to demonstrate that a summer workshop increases GPAs.

A)

2.50 to 3.50

B)

2.80 to 3.40

C)

2.70 to 3.30

D)

2.90 to 3.40