1) 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 voters in the state who favor approval.

Select one:

A. 0.444 < p < 0.500

B. 0.471 < p < 0.472

C. 0.438 < p < 0.505

D. 0.435 < p < 0.508

2) Of 260 employees selected randomly from one company, 18.46% of them commute by carpooling. Construct a 90% confidence interval for the true percentage of all employees of the company who carpool.

Select one:

A. 12.9% < p < 24.1%

B. 13.7% < p < 23.2%

C. 14.5% < p < 22.4%

D. 12.3% < p < 24.7%

3) Of 346 items tested, 12 are found to be defective. Construct the 98% confidence interval for the proportion of all such items that are defective.

Select one:

A. 0.0154 < p < 0.0540

B. 0.0118 < p < 0.0576

C. 0.0345 < p < 0.0349

D. 0.0110 < p < 0.0584

4) A survey of 300 union members in New York State reveals that 112 favor the Republican candidate for governor. Construct the 98% confidence interval for the true population proportion of all New York State union members who favor the Republican candidate.

Select one:

A. 0.308 < p < 0.438

B. 0.304 < p < 0.442

C. 0.301 < p < 0.445

D. 0.316 < p < 0.430

5) When 328 college students are randomly selected and surveyed, it is found that 122 own a car. Find a 99% confidence interval for the true proportion of all college students who own a car.

Select one:

A. 0.320 < p < 0.424

B. 0.303 < p < 0.441

C. 0.328 < p < 0.416

D. 0.310 < p < 0.434

6) Of 92 adults selected randomly from one town, 61 have health insurance. Find a 90% confidence interval for the true proportion of all adults in the town who have health insurance.

Select one:

A. 0.566 < p < 0.760

B. 0.548 < p < 0.778

C. 0.536 < p < 0.790

D. 0.582 < p < 0.744

7) Of 380 randomly selected medical students, 21 said that they planned to work in a rural community. Find a 95% confidence interval for the true proportion of all medical students who plan to work in a rural community.

Select one:

A. 0.0251 < p < 0.0854

B. 0.0323 < p < 0.0782

C. 0.0360 < p < 0.0745

D. 0.0280 < p < 0.0826

8) Of 118 randomly selected adults, 34 were found to have high blood pressure. Construct a 95% confidence interval for the true percentage of all adults that have high blood pressure.

Select one:

A. 18.1% < p < 39.6%

B. 20.6% < p < 37.0%

C. 21.9% < p < 35.7%

D. 19.1% < p < 38.5%

9) A study involves 607 randomly selected deaths, with 35 of them caused by accidents. Construct a 98% confidence interval for the true percentage of all deaths that are caused by accidents.

Select one:

A. 4.20% < p < 7.33%

B. 3.33% < p < 8.21%

C. 3.91% < p < 7.62%

D. 3.56% < p < 7.97%

10) Of 150 adults selected randomly from one town, 30 of them smoke. Construct a 99% confidence interval for the true percentage of all adults in the town that smoke.

Select one:

A. 14.6% < p < 25.4%

B. 11.6% < p < 28.4%

C. 13.6% < p < 26.4%

D. 12.4% < p < 27.6%