Page 2 has critical values and formulas

1. Insurance companies are interested in knowing the population percent of drivers who always buckle up before riding in a car. They randomly surveyed 400 drivers and found that 320 claimed they always buckle up. We are interested in the population proportion of drivers who claim they always buckle up. Construct a 95% confidence interval for the population proportion who claim they always buckle up.

2. According to a recent survey of 1,200 people, 61% feel that the president is doing an acceptable job. We are interested in the population proportion of people who feel the president is doing an acceptable job. Construct a 90% confidence interval for the population proportion of people who feel the president is doing an acceptable job.

Use the following information to answer the next three questions: According to a Field Poll, 79% of California adults (actual results are 400 out of 506 surveyed) feel that "education and our schools" is one of the top issues facing California. We wish to construct a 90% confidence interval for the true proportion of California adults who feel that education and the schools is one of the top issues facing California.

3. A point estimate for the true population proportion is ______.

1. 0.90
2. 1.27
3. 0.79
4. 400

4. A 90% confidence interval for the population proportion is _______.

1. (0.761, 0.820)
2. (0.125, 0.188)
3. (0.755, 0.826)
4. (0.130, 0.183)

5. The margin of error is approximately _____.

1. 1.581
2. 0.791
3. 0.059
4. 0.030