Discussion
To test whether the two population means are equal we use ........... test.
Answer: A
The equality of two population means is tested with the t test.
The two-sample t test compares the means of two independent samples. Its statistic divides the difference between the sample means by the standard error of that difference, and the result is compared with the t distribution with the appropriate degrees of freedom. For large samples the same test is usually done as a z test.
The F test compares two variances (and is used in analysis of variance for three or more means). The chi square test is used for goodness of fit, for independence in contingency tables and for a single variance. The Kolmogorov-Smirnov test compares whole distributions rather than means.
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