Solution :
Given that,
Sample size = n = 45
Z/2 = 2.326
Margin of error = E = Z/2* ( /n)
= 2.326 * (0.7 / 45)
Margin of error = E = 0.24
At 98% confidence interval estimate of the population mean is,
- E < < + E
9.2 - 0.24 < < 9.2 + 0.24
8.96 < < 9.44
The 98% confidence interval for is (8.96 , 9.44)
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