5. The average test scores in a Physics class are normally distributed with a standard deviation of 5.4. 50 scores with a sample mean of 79 were selected at random. (a) Find the 95% confidence interval for the population mean test score. (b) What is the value of the margin of error? ?

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Add tables, inferences and conclusion if necessary
5. The average test scores in a Physics class are
normally distributed with a standard deviation of 5.4.
50 scores with a sample mean of 79 were selected
at random. (a) Find the 95% confidence interval for
the population mean test score. (b) What is the value
of the margin of error? ?
Transcribed Image Text:5. The average test scores in a Physics class are normally distributed with a standard deviation of 5.4. 50 scores with a sample mean of 79 were selected at random. (a) Find the 95% confidence interval for the population mean test score. (b) What is the value of the margin of error? ?
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