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A recent study focused on the number of times men and women send a twitter message in a day. the sample information is summarized below. at the .01 significance level, is there a difference in the mean number of times men and women send a twitter message in a day? what is the test statistic for this hypothesis? question 6 options: 1) z-statistic 2) t-statistic 3) p-statistic 4) df-statistic

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missbianca
The answer is 1) z-statistic

The following is the said summarized information:

Men Sample size-25 Sample mean-20 Population standard deviation-5
Women Sample size-30 Sample mean-30 Population standard deviation-10

We know the population standard deviation so we can probably use z test

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