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Some groups have clamored that the difference in expected lifespan between males and females is a result of social rather tha

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Answer #1

Solution:

The formula for test statistic is given as below:

Test statistic = (X̄1 - X̄2) / Standard error

We are given

X̄1 = 80.6

X̄2 = 76.3

Standard error = 2.166

Test statistic = (80.6 - 76.3) / 2.166

Test statistic = 4.3/2.166

Test statistic = 1.985226

Test statistic = 1.985

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