1. If the margin of error in an interval estimate of is 7.6, the interval estimate equals _____.

a. x 7.6

b. x 4.508

c. x 6.9

d. x 2.3

2. If the margin of error in an interval estimate of is 5.8, the interval estimate equals.

a. x 3.4

b. x 10.2

c. x 5.8

d. x 6.664

3. In determining an interval estimate of a population mean when is unknown, we use a t distribution with _____ degrees of freedom.

a. n

b. n

c. n 1

d. n-1

4. An interval estimate is used to estimate:

a. a sample statistic

b. a population parameter

c. the sampling distribution

d. the shape of the population's distribution

5. As the sample size increases, the margin of error.

a. increases

b. stays the same

c. decreases

d. becomes negative

6. The confidence associated with an interval estimate is called the _____.

a. precision

b. degree of association

c. level of significance

d. confidence level