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A study of 100 QDA professors showed that the time to create a test question was 13.0 minutes. The standard deviation of the popula
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A study of 100 QDA professors showed that the time to create a test question was 13.0 minutes. The standard deviation of the popula
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Question 45469: Hi,
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A study of 100 QDA professors showed that the time to create a test question was 13.0 minutes. The standard deviation of the population was 2. Find the 90% confidence interval of the population mean.
Thanks for your help Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! A study of 100 QDA professors showed that the time to create a test question was 13.0 minutes. The standard deviation of the population was 2. Find the 90% confidence interval of the population mean.
Margin of error = 1.645(2/sqrt100)=0.329
Confidence interval = (13-0.329,13+0.329)
=(12.671,13.329)
Cheers,
Stan H.
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