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| 1 | |
In testing the difference between two means from two independent populations, the sample sizes do not have to be equal. |
| | A) | True |
| | B) | False |
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| 2 | |
An experiment in which there is no relationship between the measurements on the different samples is a(n) ______experiment. |
| | A) | Paired difference |
| | B) | Equal variances |
| | C) | Independent samples |
| | D) | Dependent samples |
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| 3 | |
In testing the difference between the means of two normally distributed populations using independent random samples, we can only use a two-sided test. |
| | A) | True |
| | B) | False |
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| 4 | |
In testing the equality of two population means by using independent random samples, if the null hypothesis of equal population means is rejected at α = .01, it will ______ be rejected at α = .05. |
| | A) | always |
| | B) | sometimes |
| | C) | never |
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| 5 | |
When comparing two population means based on independent random samples, the pooled estimate of the variance is used when there is an assumption of equal population variances. |
| | A) | True |
| | B) | False |
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| 6 | |
In testing the difference between the means of two independent samples, the correct test statistic to use is: |
| | A) | t statistic. |
| | B) | F statistic. |
| | C) | Chi-square statistic. |
| | D) | None of the above. |
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| 7 | |
In forming a confidence interval for µ1 - µ2, only two assumptions are required: independent samples and sample sizes of at least 30. |
| | A) | True |
| | B) | False |
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| 8 | |
In testing a hypothesis about the mean, µd, of a population of paired differences, the correct test statistic to use is: |
| | A) | Z statistic. |
| | B) | t statistic. |
| | C) | F statistic. |
| | D) | Chi-square statistic. |
| | E) | None of the above. |
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| 9 | |
The degrees of freedom for a t test on a paired difference experiment with a sample of size 7 is: |
| | A) | 7 |
| | B) | 6 |
| | C) | 14 |
| | D) | 12 |
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| 10 | |
The controller of a chain of toy stores is interested in determining whether there is any difference in the weekly sales of store 1 and store 2. The weekly sales are normally distributed. This problem should be analyzed using an independent means method. |
| | A) | True |
| | B) | False |
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| 11 | |
The F statistic can assume either a positive or a negative value. |
| | A) | True |
| | B) | False |
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| 12 | |
In testing the difference between two population variances, if s12 = s22, the calculated value of F will be equal to one. |
| | A) | True |
| | B) | False |
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| 13 | |
When comparing the variances of two normally distributed populations using independent random samples, the correct test statistic to use is: |
| | A) | Z statistic. |
| | B) | t statistic. |
| | C) | F statistic. |
| | D) | Chi-square statistic. |
| | E) | None of the above. |
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| 14 | |
The curve of the F distribution is not skewed. |
| | A) | True |
| | B) | False |
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| 15 | |
The validity of the F test is very sensitive to violations of the normality assumption of equal variances. |
| | A) | True |
| | B) | False |
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