When the sample sizes are equal, the pooled variance of the two groups is the average of the two sample variances.
举一反三
- For all two-sample tests, the sample sizes must be equal in the two groups.
- For all two-sample tests, the sample sizes must be equal in the two groups. A: 正确 B: 错误
- The term ‘variance’ of the method ‘Analysis of Variance’ means: . A: The method is to compare the difference of population variances B: The method is to compare the difference of sample variances C: The method requires that variances of different groups should be equal D: The method calculates MS and compares MS, while MS is variance in concept E: The method calculates SS and compares SS, while SS is variance in concept
- in comparing the means of two independent population , sample are randomly selected from normally distributed populations and population variances are equal, we can use paired t test for the mean difference.
- When testing for a difference in two population means from small samples, a pooled variance must be computed when ___________.