Which is a pair of equal expressions?
2 answers:
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<h2>Answer with explanation:</h2>
Let be the population mean.
As per given we have,
, since alternative hypothesis is right tailed , so the test is a right-tailed test.
Test statistic :
For, n=80 , we have
Critical z-value at =1.645
Since the test statistic value is greater than the critical z-value, so we reject the null hypothesis, i.e. alternative hypothesis is accepted.
Conclusion: We have enough evidence to support the claim that the mean work week has increased for women at the 5% level.