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Independent simple random samples of 950 men and 2500 women are tested. Among the men in...

Independent simple random samples of 950 men and 2500 women are tested. Among the men in the sample, 81 have red/green color blindness. Among the women in the sample, 9 have red/green color blindness.

The value of the test statistic is z=    (round to at least three decimal places).

A sample of 56 students who live on-campus has a mean GPA of 83.7 with a sample standard deviation of 7.44. A independent sample of 42 students who live off-campus has a mean GPA of 82.4 with a standard deviation of 5.45

The value of the test statistic is

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