Answers
Solution :
Given that,
Point estimate = sample mean = 
Population standard deviation = 
Sample size = n = 758
At 90% confidence level
Z
Margin of error = E = Z
/
= 1.645 * ( 9.2 /
= 0.5
At 90% confidence interval estimate of the population mean is,
± E
24.3 ± 0.5
( 23.8, 24.8 )
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