7. A random sample of 80 observations produced a mean x = 35.4 and a standard deviation s= 31 a. Find a 90% confidence interval for the population mean µ. b.Find a 95% confidence interval for u. c....

7. A random sample of 80 observations produced a mean x = 35.4 and a standard deviation s= 31<br>a. Find a 90% confidence interval for the population mean µ.<br>b.Find a 95% confidence interval for u.<br>c. Find a 99% confidence interval for u.<br>d. What happens to the width of a confidence interval as the value of the confidence coefficient is<br>increased while the sample size is held fixed?<br>

Extracted text: 7. A random sample of 80 observations produced a mean x = 35.4 and a standard deviation s= 31 a. Find a 90% confidence interval for the population mean µ. b.Find a 95% confidence interval for u. c. Find a 99% confidence interval for u. d. What happens to the width of a confidence interval as the value of the confidence coefficient is increased while the sample size is held fixed?

Jun 10, 2022

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7. A random sample of 80 observations produced a mean x = 35.4 and a standard deviation s= 31 a. Find a 90% confidence interval for the population mean µ. b.Find a 95% confidence interval for u. c....

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