5 The z value for a 978 confidence interval estimation is a

5. The z value for a 97.8% confidence interval estimation is.

a. 2.02

b. 1.96

c. 2.00

d. 2.29

6. The t value for a 95% confidence interval estimation with 24 degrees of freedom is.

a. 1.711

b. 2.064

c. 2.492

d. 2.069

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

a. increases

b. decreases

c. stays the same

d. increases or decreases depending on the size of the mean

8. The ability of an interval estimate to contain the value of the population parameter is described by the.

a. confidence level

b. degrees of freedom

c. precise value of the population mean

d. degrees of freedom minus 1