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 ___________.
内容
- 0
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.
- 1
Rate variances are the same as ________ variances. Efficiency variances are the same as ________ variances.
- 2
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
- 3
Analysis<br/>of Variance is a test for equality of () A: Variances. B: Means. C: Proportions. D: only<br/>two parameters. E: distributions.
- 4
The sample variance is an unbiased estimator of the population variance.