Solution :
Given that,
Sample size = n = 54
Z/2 = 1.96
Margin of error = E = Z/2* ( /n)
= 1.96 * (0.5 / 54)
Margin of error = E = 0.13
At 95% confidence interval estimate of the population mean is,
- E < < + E
7.9 - 0.13 < < 7.9 + 0.13
7.77 < < 8.03
A 95% confidence interval for is (7.77 , 8.03)
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