In constructing a confidence interval estimate for the difference between the means of two independent normally distributed populations, we:
If we are testing for the difference between the means of two independent populations with equal variances, samples of n1 = 15 and n2 = 15 are taken, then the number of degrees of freedom is equal to If we are testing for the difference between the means of two independent populations with equal variances, samples of n1 = 15 and n2 = 15 are taken, then the number of degrees of freedom is equal to If we are testing for the difference between the means of two independent populations with equal variances, samples of n1 = 15 and n2 = 15 are taken, then the number of degrees of freedom is equal to
| a. pool the sample variances when the population means are equal. | | |
| b. never pool the sample variances. | | |
| c. pool the sample variances when the unknown population variances are equal. | | |
| d. pool the sample variances when the population variances are known and equal. | | |
1. Pool the sample variances when the unknown population variances are equal
2. 28
3.38
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