I need help how can I answers A, B , C , D
Answer:
a).
population standard deviation is given, we use z distribution for confidence interval.
For 99%, z=2.576
= (0.9877, 1.0023)
b).
There is no reason to complain because the value 1 gallon is contained in the 99% confidence interval (0.9877, 1.0023).
c).
since the sample size is 50 which is greater than 30, we need not necessary to assume normality.
d).
For 99%, z=1.96
= (0.9895, 1.0005)
95% CI is less wider than 99% CI.
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