Brenda’s scores on the first three of four 100-point science tests were 95, 92, and 89. What score does she need on her fourth s
2 answers:
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Answer with explanation:
Given : Sample mean =
Standard deviation :
Sample size : n = 36
Claim :
∴
Since the alternative hypothesis is two tail , then the test is two tail test.
By using a z statistic and a 0.05 level of significance. Reject if z < -1.960 or is z> 1.960.
Then , the test static for population mean is given by :-
We reject since
. We have statistically significant evidence at
to show that the mean amount of garbage per bin is not different from 50.
The empirical rule says 68% of the distribution should fall within one standard deviation of the mean, so you should expect salaries between 
and 