Statistics Final Review Chapters 7,8,9

1.
STAT10T 7.2.1-2
(Points: 5.0) Solve the problem.

Find the critical value zα/2 that corresponds to a degree of confidence of 91%.

a. 1.645

b. 1.75

c. 1.34

d. 1.70
2.
STAT10T 7.2.3-2
(Points: 5.0) Solve the problem.

The following confidence interval is obtained for a population proportion, p:
0.817 < p < 0.855
Use these confidence interval limits to find the point estimate, .

a. 0.833

b. 0.817

c. 0.839

d. 0.836

3.
STAT10T 7.2.4-3
(Points: 5.0) Find the margin of error for the 95% confidence interval used to estimate the population proportion.

In a survey of 7100 T.V. viewers, 40% said they watch network news programs.

a. 0.0131

b. 0.0150

c. 0.0114

d. 0.00855
4.
STAT10T 7.2.5-1
(Points: 5.0) Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p.

n = 61, x = 19; 95 percent

a. 0.194 < p < 0.428

b. 0.195 < p < 0.427

c. 0.213 < p < 0.409

d. 0.214 < p < 0.408
5.
STAT10T 7.2.6-2
(Points: 5.0) Find the minimum sample size you should use to assure that your estimate of will be within the required margin of error around the population p.

Margin of error: 0.016; confidence level: 97%; and unknown

a. 34

b. 4599

c. 1

d. 4598
6.
STAT10T 7.2.7-5
(Points: 5.0) Find the minimum sample size you should use to assure that your estimate of will be within the required margin of error around the population p.

Margin of error: 0.008; confidence level: 99%; from a prior study, is estimated by 0.164

a. 14,205

b. 114

c. 8230

d. 12,785
7.
STAT10T 7.2.9-1
(Points: 5.0) Use the given degree of confidence and sample data to construct a confidence interval for the population proportion p.

A survey of 865 voters in one state reveals that 408 favor approval of an issue before the legislature. Construct the 95% confidence interval for the true proportion of all