Question 565415
Assume the population standard deviation for the number of units produced on the day shift is 21 and is 28 on the night shift. 
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A sample of 54 day-shift workers showed that the mean number of units produced was 345.
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A sample of 60 night-shift workers showed that the mean number of units produced was 351. 
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At the .05 significance level, is the number of units produced on the night shift larger?
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Ho: u(night) u(day) <= 0
Ha: u(night) u(day) >  0 (claim)
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I ran a 2-Sample Ztest and got the following:
test statistic: 1.3921
p-value = 0.0964
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Conclusion: Since the p-value is greater than 5%,
fail to reject Ho.
The test results do not support the claim.
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Cheers,
Stan H.
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