The standard deviation for a population is 14 8 A sample of 25 observations selected from this population gave a mean equal to 143 72 The population is known to have a normal distribution a Make a 99 confidence interval for b Construct a 95 confidence interval for c Determine a 90 confidence interval for d Does the width of the confidence intervals constructed in parts a through c decrease as the confidence level decreases Explain your answer

Question: The standard deviation for a population is = 14.8. A sample of 25 observations selected from this population gave a mean equal to 143.72.

The standard deviation for a population is σ = 14.8. A sample of 25 observations selected from this population gave a mean equal to 143.72. The population is known to have a normal distribution.
a. Make a 99% confidence interval for µ.
b. Construct a 95% confidence interval for µ.
c. Determine a 90% confidence interval for µ.
d. Does the width of the confidence intervals constructed in parts a through c decrease as the confidence level decreases? Explain your answer.

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n 25 14372 148 and n 14825 296 a The 99 confidence interval for is z 14372 258296 14372 764 ... View full answer

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