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5. Of 84 adults selected...

5. Of 84 adults selected randomly from one town, 62 have health insurance. Find a 90% confidence interval for the true proportion of all adults in the town who have health insurance.

A. 0.626<p<0.850

B. 0.615<p<0.862

C. 0.644<p<0.832

D. 0.659<p<0.817

6.The duration of telephone calls directed by a local telephone company: σ=4.2 minutes, n=500, 97% confidence. Use the confidence level and sample data to find the margin of error E.

A. 0.018 min

B. 0.408 min

C. 0.009 min

D. 0.087 min

7.How many commuters must be randomly selected to estimate the mean driving time of Chicago commuters? We want 98% confidence that the sample mean is within 2 minutes of the population mean, and the population standard deviation is known to be 10 minutes.

A. 68

B. 136

C. 166

D. 97

8.Thirty randomly selected students took the calculus final. If the sample mean was 89 and the standard deviation was 6.2, construct a 99% confidence interval of the mean score of all students. Assume that the population has a normal distribution.

A. 85.89<µ<92.11

B. 85.88<µ<92.12

C. 87.08<µ<90.92

D. 86.21<µ<91.79

9.α=0.05 for a two-tailed test. Assume that the data has a normal distribution and the number of observations is greater than fifty. Find the critical z value used to test a null hypothesis.

A. ±1.96

B. ±1.764

C. ±1.645

D. ±2.575

10. In a sample of 47 adults selected randomly from one town, it is found that 9 of them have been exposed to a particular strain of the flu. Find the P-value for a test of the claim that the proportion of all adults in the town that have been exposed to this strain of the flu is 8%.

A. 0.0024

B. 0.0524

C. 0.0048

D. 0.0262

11.For a simple random sample, the size is n=17, σ is not known, and the original population is normally distributed. Determine whether the give conditions justify testing a claim about a population mean µ.

A. Yes

B. No

12.A medical researcher claims that 20% of children suffer from a certain disorder. Indentify the type I error for the test.

A. Fail to reject the claim that the percentage of children who suffer from the disorder is equal to 20% when the percentage is actually 20%.

B. Reject the claim that the percentage of children who suffer from the disorder is different from 20% when that percentage really is different from 20%.

C. Fail to reject the claim that the percentage of children who suffer from the disorder is equal to 20% when that percentage is actually different from 20%.

D. Reject the claim that the percentage of children who suffer from the disorder is equal to 20% when that percentage is actually 20%.

A. 0.626<p<0.850

B. 0.615<p<0.862

C. 0.644<p<0.832

D. 0.659<p<0.817

6.The duration of telephone calls directed by a local telephone company: σ=4.2 minutes, n=500, 97% confidence. Use the confidence level and sample data to find the margin of error E.

A. 0.018 min

B. 0.408 min

C. 0.009 min

D. 0.087 min

7.How many commuters must be randomly selected to estimate the mean driving time of Chicago commuters? We want 98% confidence that the sample mean is within 2 minutes of the population mean, and the population standard deviation is known to be 10 minutes.

A. 68

B. 136

C. 166

D. 97

8.Thirty randomly selected students took the calculus final. If the sample mean was 89 and the standard deviation was 6.2, construct a 99% confidence interval of the mean score of all students. Assume that the population has a normal distribution.

A. 85.89<µ<92.11

B. 85.88<µ<92.12

C. 87.08<µ<90.92

D. 86.21<µ<91.79

9.α=0.05 for a two-tailed test. Assume that the data has a normal distribution and the number of observations is greater than fifty. Find the critical z value used to test a null hypothesis.

A. ±1.96

B. ±1.764

C. ±1.645

D. ±2.575

10. In a sample of 47 adults selected randomly from one town, it is found that 9 of them have been exposed to a particular strain of the flu. Find the P-value for a test of the claim that the proportion of all adults in the town that have been exposed to this strain of the flu is 8%.

A. 0.0024

B. 0.0524

C. 0.0048

D. 0.0262

11.For a simple random sample, the size is n=17, σ is not known, and the original population is normally distributed. Determine whether the give conditions justify testing a claim about a population mean µ.

A. Yes

B. No

12.A medical researcher claims that 20% of children suffer from a certain disorder. Indentify the type I error for the test.

A. Fail to reject the claim that the percentage of children who suffer from the disorder is equal to 20% when the percentage is actually 20%.

B. Reject the claim that the percentage of children who suffer from the disorder is different from 20% when that percentage really is different from 20%.

C. Fail to reject the claim that the percentage of children who suffer from the disorder is equal to 20% when that percentage is actually different from 20%.

D. Reject the claim that the percentage of children who suffer from the disorder is equal to 20% when that percentage is actually 20%.

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