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Solve the problem. Assume that a test will be conducted of the claim that two samples come from populations with the same mean. Assume that the samples are independent and have been randomly selected. 
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| Reject H0 if test statistic > 2.575. |
| Reject H0 if test statistic < -2.575. |
| Reject H0 if test statistic < 2.575 and > -2.575. |
| Reject H0 if test statistic < -2.575 or > 2.575. |
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Construct the indicated confidence interval for the difference between the two population means. Assume that the two samples are independent and that they have been randomly selected. 
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| (5.67, 7.91) |
| (5.85, 7.73) |
| (5.88, 7.70) |
| (-7.73, -5.85) |
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Solve the problem. 
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| 0.6331 |
| 0.8413 |
| 0.3339 |
| 0.1587 |
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The two data sets are dependent. Find overbar(d) to the nearest tenth. 
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| 35.2 |
| 211.2 |
| 45.8 |
| 21.1 |
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Find sd. The differences between two sets of dependent data are 0.22 0.4 0.32 0.32 0.3. Round to the nearest hundredth.
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| 0.18 |
| 0.03 |
| 0.09 |
| 0.06 |
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Assume that you want to test the claim that the paired sample data come from a population for which the mean difference is µd = 0. Compute the value of the t test statistic. 
|
| 0.351 |
| 1.052 |
| 9.468 |
| 3.156 |
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Determine the decision criterion for rejecting the null hypothesis in the given hypothesis test; i.e., describe the values of the test statistic that would result in rejection of the null hypothesis. 
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| Reject H0 if test statistic is greater than -1.895. |
| Reject H0 if test statistic is greater than -1.895 and less than 1.895. |
| Reject H0 if test statistic is greater than 1.895. |
| Reject H0 if test statistic is less than 1.895. |
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|
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Construct a confidence interval for µd, the mean of the differences d for the population of paired data. Assume that the population of paired differences is normally distributed. 
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| 1.2 < µd < 2.8 |
| -0.1 < µd < 4.1 |
| -0.5 < µd < 4.5 |
| -0.2 < µd < 4.2 |
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|
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Find the number of successes x suggested by the given statement. A computer manufacturer randomly selects 2690 of its computers for quality assurance and finds that 2.6% of these computers are found to be defective.
|
| 75 |
| 73 |
| 70 |
| 68 |
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|
|
|
| 0.391 |
| 0.586 |
| 0.592 |
| 0.195 |
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Compute the test statistic used to test the null hypothesis that p1 = p2. Information about movie ticket sales was printed in a movie magazine. Out of fifty PG-rated movies, 38% had ticket sales in excess of $3,000,000. Out of thirty-five R-rated movies, 20% grossed over $3,000,000.
|
| 3.545 |
| 1.773 |
| 2.646 |
| 5.127 |
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|
|
|
| Reject H0 if test statistic is greater than -1.28. |
| Reject H0 if test statistic is less than 1.28. |
| Reject H0 if test statistic is less than -1.28. |
| None of the above is correct. |
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|
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Find the appropriate p-value to test the null hypothesis, H0: p1 = p2, using a significance level of 0.05. 
|
| .4211 |
| .0021 |
| .0512 |
| .0086 |
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Construct the indicated confidence interval for the difference between population proportions p1 - p2. Assume that the samples are independent and that they have been randomly selected. In a random sample of 300 women, 50% favored stricter gun control legislation. In a random sample of 200 men, 25% favored stricter gun control legislation. Construct a 98% confidence interval for the difference between the population proportions p1 - p2.
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| 0.152 < p1 - p2 < 0.348 |
| 0.168 < p1 - p2 < 0.332 |
| 0.141 < p1 - p2 < 0.359 |
| 0.164 < p1 - p2 < 0.336 |