A recent study focused on the number of times men and women send a Twitter message in a day. The information is summarized below. Men  sample size - 25           sample mean - 20          population standard deviation - 5 Women  sample size - 30           sample mean - 30          population standard deviation - 10   At the 0.02 significance level, is there a difference in the mean number of times men and women send a Twitter message in a day?

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A:

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A:

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A:

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