Word problem:
1 answer:
You might be interested in
<h2>Answer with explanation:</h2>
Let the population mean.
The hypothesis for the given situation :-
, since the alternative hypothesis is left-tailed , so the test a left-tailed test.
The sample size : , since n>30 so its a large sample . We use z-test.
Sample mean :
Standard deviation :
Significance level :
The test statistic for population mean :-
i.e.
The p-value :
Since, the p-value is less than the significance level , so we reject the null hypothesis.
Hence, we have evidence to accept the agency's claim that the brewery is cheating its customers.