Solution :
Given that,
Sample size = n = 3611
Z/2 = 2.576
Margin of error = E = Z/2* ( /n)
= 2.576 * (1.5 / 3611)
Margin of error = E = 0.1
At 99% confidence interval estimate of the population mean is,
- E < < + E
7.4 - 0.1 < < 7.4 + 0.1
7.3 < < 7.5
(7.3 , 7.5)
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