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: 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.
举一反三
- To compute an interval estimate for the difference between the means of two populations, the t distribution is restricted to small sample situations.
- 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.
- Analysis of Variance (ANOVA) is a test for the difference in . A: means of two or more samples B: means of three or more samples C: vairance of three or more smaples D: means of two or more populations E: variance of two or more populations
- When the sample sizes are equal, the pooled variance of the two groups is the average of the two sample variances.
- Which of the following is most effected by genetic drift? A: small populations B: isolated populations C: large populations D: populations with very few natural competitors