1. QUESTION 1For a test of a mean, which of the following is incorrect?
2. The critical value is based on the researcher's chosen level of significance.
3. In a right-tailed test, we reject H0 when the test statistic exceeds the critical value.
4. H0 is rejected when the calculated p-value is less than the critical value of the test statistic.
5. If H0: 100 and H1: > 100, then the test is right-tailed.

1 points

1. QUESTION 2For a right-tailed test of a hypothesis for a population mean with n = 14, the value of the test statistic was t = 1.863. The p-value is:
2. between .10 and .05.
3. greater than .10.
4. less than .01.
5. between .05 and .025.

1 points

1. QUESTION 3The critical value in a hypothesis test:
2. is a cutoff between the rejection and nonrejection regions.
3. is a test statistic calculated from the sample.
4. is another name for level of significance.
5. is a contradictory result from a different test.

1 points

1. QUESTION 4The rejection region in a hypothesis test:
2. is an area in the tail(s) of a sampling distribution.
3. is a consensus formed by trained statisticians.
4. is always equal to the p-value in the test.
5. is always set to correspond to = .05 in the test.

1 points

1. QUESTION 5Guidelines for the Jolly Blue Giant Health Insurance Company say that the average hospitalization for a triple hernia operation should not exceed 30 hours. A diligent auditor studied records of 16 randomly chosen triple hernia operations at Hackmore Hospital and found a mean hospital stay of 40 hours with a standard deviation of 20 hours. "Aha!" she cried, "the average stay exceeds the guideline." The value of the test statistic for her hypothesis is:
2. 2.080
3. 1.866
4. 0.481
5. 2.000

1 points

1. QUESTION 6Dullco Manufacturing claims that its alkaline batteries last at least 40 hours on average in a certain type of portable CD player. But tests on a random sample of 18 batteries from a day's large production run showed a mean battery life of 37.8 hours with a standard deviation of 5.4 hours. In a left-tailed test at = .05, which is the most accurate statement?
2. We would clearly fail to reject the claim.
3. We would face a rather close decision.
4. We would switch to = .01 for a more powerful test.
5. We would strongly reject the claim.

1 points

1. QUESTION 7The rejection region in a hypothesis test:
2. is an area in the tail(s) of a sampling distribution.
3. is always equal to the p-value in the test.
4. is always set to correspond to = .05 in the test.
5. is a consensus formed by trained statisticians.

1 points

1. QUESTION 8Guidelines for the Jolly Blue Giant Health Insurance Company say that the average hospitalization for a triple hernia operation should not exceed 30 hours. A diligent auditor studied records of 16 randomly chosen triple hernia operations at Hackmore Hospital, and found a mean hospital stay of 40 hours with a standard deviation of 20 hours. "Aha!" she cried, "the average stay exceeds the guideline." The p-value for a right-tailed test of her hypothesis is:
2. between .05 and .10.
3. between .025 and .05.
4. between .01 and .025.
5. less than .01.

1 points

1. QUESTION 9The critical value in a hypothesis test:
2. depends on the value of the test statistic.
3. separates the acceptance and rejection regions.
4. usually is .05 or .01 in most statistical tests.
5. is calculated from the sample data.

1 points

1. QUESTION 10Hypothesis tests for a mean using the critical value method require:
2. sampling a normal population.
3. knowing the true population mean.
4. specifying in advance.
5. using a two-tailed test.

1 points

1. QUESTION 11A sample of 16 ATM transactions shows a mean transaction time of 67 seconds with a standard deviation of 12 seconds. Find the test statistic to decide whether the mean transaction time exceeds 60 seconds.
2. 1.848
3. 2.037
4. 2.333
5. 1.457

1 points

1. QUESTION 12For a right-tailed test of a hypothesis for a single population mean with n = 10, the value of the test statistic was t = 1.411. The p-value is:
2. greater than .10.
3. between .05 and .025.
4. less than .001.
5. between .10 and .05.

1 points

1. QUESTION 13Which of the following is not a characteristic of the t distribution?
2. It is similar to the z distribution when n is small.
3. It has a mean of zero.
4. It a symmetric distribution.
5. It is a continuous distribution.

1 points

1. QUESTION 14Dullco Manufacturing claims that its alkaline batteries last at least 40 hours on average in a certain type of portable CD player. But tests on a random sample of 18 batteries from a day's large production run showed a mean battery life of 37.8 hours with a standard deviation of 5.4 hours. To test DullCo's hypothesis, the p-value is:
2. exactly equal to .05.
3. uncertain without knowing .
4. slightly greater than .05.
5. slightly less than .05.

1 points

1. QUESTION 15Dullco Manufacturing claims that its alkaline batteries last at least 40 hours on average in a certain type of portable CD player. But tests on a random sample of 18 batteries from a day's large production run showed a mean battery life of 37.8 hours with a standard deviation of 5.4 hours. To test DullCo's hypothesis, the test statistic is:
2. 1.728
3. 2.101
4. 1.960
5. 1.980

1 points

1. QUESTION 16For tests of a mean, if other factors are held constant, which statement is correct?
2. The critical value of Student's t increases as n increases.
3. A test statistic tcalc = 1.853 with n = 16 leads to rejection at = .05 in a one-tailed test.
4. It is harder to reject the null hypothesis in a two-tailed test rather than a one-tailed test.
5. If we desire = .10, then a p-value of .13 would lead us to reject the null hypothesis.

1 points

1. QUESTION 17The critical value in a hypothesis test:
2. is derived from the sample.
3. is a dissenting view by scientific critics.
4. is another name for the null hypothesis.
5. is determined by and the type of test.