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| 1 | |
In a two-sample test of means for independent samples, the equal sign always appears in the |
| | A) | Null hypothesis. |
| | B) | Alternate hypothesis. |
| | C) | Upper tail of the test statistic. |
| | D) | Lower tail of the test statistic. |
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| 2 | |
In a two-sample test of means for independent samples, we use the z distribution when |
| | A) | The two population standard deviations are equal. |
| | B) | Both populations have at least 4000 observations. |
| | C) | Both population standard deviations are known. |
| | D) | nπ and n(1-π) are both greater than 5. |
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| 3 | |
A random sample of 10 observations is selected from the first normal population and 8 from the second normal population. For the hypothesis, H0: μ1 ≤ μ2, what is the number of degrees of freedom? |
| | A) | 18 |
| | B) | 17 |
| | C) | 16 |
| | D) | 9 |
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| 4 | |
A random sample of 10 observations is selected from the first normal population and 8 from the second normal population. For the hypothesis, H0: μ1 ≤ μ2, (.01significance level), what is (are) the critical value(s)? (Population standard deviations are unknown). |
| | A) | 2.583 |
| | B) | -2.921, 2.921 |
| | C) | -2.583, 2.583 |
| | D) | -2.583, 2.921 |
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| 5 | |
When testing a hypothesis of the means for independent populations (population standard deviations unknown), what should be true? |
| | A) | nπ and n(1-π) are both greater than 5. |
| | B) | Both populations are normally distributed. |
| | C) | The samples sizes selected from each population must be equal. |
| | D) | Both B and C |
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| 6 | |
To conduct a test of means for two independent populations, which of the following is required? |
| | A) | The z-statistic is the test statistic. |
| | B) | The t-statistic is the test statistic. |
| | C) | nπ and n (1 - π) must be 5. |
| | D) | Sampling from the two populations must be random. |
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| 7 | |
Another way to state the null hypothesis: H0: μ1 = μ2, is |
| | A) | H0: μ1≤ μ2 |
| | B) | H0: μ1 - μ2 = 0 |
| | C) | H0: μ1 ≥ μ2 |
| | D) | H0: μ1 - μ2 ≠ 0 |
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| 8 | |
To conduct a test of hypothesis for dependent populations, we assume that |
| | A) | The distribution of the difference between the sampled paired observations follows the normal distribution. |
| | B) | Both samples are at least 30. |
| | C) | The samples are unrelated. |
| | D) | nπ and n(1-π) are both greater than 5. |
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| 9 | |
When conducting a test of hypothesis for dependent samples |
| | A) | The sample size should be at least 30 pairs of observations. |
| | B) | The significance level is more than .05. |
| | C) | The p-value is more than .10. |
| | D) | None of the above. |
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| 10 | |
Which of the following is necessary to determine a p-value? |
| | A) | Knowledge of whether the test is one-tailed or two-tailed. |
| | B) | The value of the test statistic. |
| | C) | The level of significance. |
| | D) | Both A and B |
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