The tennis team wants to purchase T-shirts for it's members. Company A charges a $20 set up fee and $8 per shirt. Company B char
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Answer:
Step-by-step explanation:
Given : Sample size : n= 36 , which is a large sample (n>30) so the test applied here is z-test.
Significance level :
Using Standard normal table , Critical value :
Sample mean :
Standard deviation:
The confidence interval for population means is given by :-
i.e.
Hence, the 95 percent confidence interval for the fill rate =