Homework Answers
18) Here we have 90% confidence interval of the population mean is = (70.7 , 73.5)
Lower bound = 70.7
Upper bound = 73.5
Margin of error = (Upper bound - Lower bound ) / 2
= (73.5 - 70.7) /2
= 1.4
Correct option "A" (1.4)
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