Thirty-nine randomly selected students in a college took the stat final. The sample mean was 68.9 with standard deviation 8.3 .
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Answer: 82
Step-by-step explanation:
The formula to find the sample size is given by :-
, where E = Margin of error.
= Population standard deviation for the prior study.
As per given , we have
gallons.
Margin of error : E= 110 gallons
Critical value for 99% confidence level = z* = 2.576
Then, the required sample size :
{Rounded to the nearest integer.}
Hence, the minimum sample size = 82