Chapter 8: Q 8.15RP. (page 347)
A random sample of size is taken from a population. A normal probability plot of the sample data shows no outliers but has significant curvature. The population standard deviation is known.
The normal probability shows that the distribution of the data is roughly linear with some outliers.
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A confidence interval for a population mean has a margin of error of
a. Determine the length of the confidence interval.
b. If the sample mean is , obtain the confidence interval.
c. Construct a graph that illustrates your results.
A confidence interval for a population mean has a length of .
a. Determine the margin of error.
b. If the sample mean is , determine the confidence interval.
c. Construct a graph that illustrates your results.
Big Bucks. In the article "The Club" (The Business Journal, Vol. 24, Issue 14, Pp. 80-82), J. Trunelle et al. examined Arizona public-company executives with salaries and bonuses totaling over The following data provide the salaries, to the nearest thousand dollars, of a random sample of such executives. 
A simple random sample of size is taken from a population with an unknown standard deviation. A normal probability plot of the data displays significant curvature but no outliers. Can you reasonably apply the interval procedure? Explain your answer.
A variable has a mean of and a standard deviation of Four observations of this variable have a mean of and a sample standard deviation of . Determine the observed value of the
a. standardized version of .
b. studentized version of .
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