For all two-sample tests, the sample sizes must be equal in the two groups.
举一反三
- For all two-sample tests, the sample sizes must be equal in the two groups. A: 正确 B: 错误
- When the sample sizes are equal, the pooled variance of the two groups is the average of the two sample variances.
- To compute an interval estimate for the difference between the means of two populations, the t distribution __ A: is restricted to small sample situations. B: is not restricted to small sample situations. C: can be applied when the populations have equal means. D: can be applied only when the populations have equal standard deviations.
- A researcher wants to estimate the difference in the means of two populations. A random sample of 36 items from the first population results in a sample mean of 430. A random sample of 49 items from t
- 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.