Chapter 8: Q.46 (page 479)
Which distribution should you use for this problem?
Short Answer
The distribution required for this problem is distribution with parameters
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Chapter 8: Q.46 (page 479)
Which distribution should you use for this problem?
The distribution required for this problem is distribution with parameters
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Construct a confidence interval for the population mean time spent waiting. State the confidence interval, sketch the graph, and calculate the error bound .
On May , Gallup reported that of the people surveyed, of U.S. workers believe that they will continue working past retirement age. The confidence level for this study was reported at with a margin of error.
a. Determine the estimated proportion from the sample.
b. Determine the sample size.
c. Identify CL and .
d. Calculate the error bound based on the information provided.
e. Compare the error bound in part d to the margin of error reported by Gallup. Explain any differences between the values.
f. Create a confidence interval for the results of this study.
g. A reporter is covering the release of this study for a local news station. How should she explain the confidence interval to her audience?
Construct a confidence interval for the population mean weight of the heads of lettuce. State the confidence interval, sketch the graph and calculate the error bound.
You do a study of hypnotherapy to determine how effective it is in increasing the number of hours of sleep subjects get each night. You measure hours of sleep for subjects with the following results. Construct a % confidence interval for the mean number of hours slept for the population (assumed normal) from which you took the data. ; ; ; ; ; ; ; ; ; ; ;
Suppose average pizza delivery times are normally distributed with an unknown population mean and a population standard deviation of six minutes. A random sample of pizza delivery restaurants is taken and has a sample mean delivery time of minutes.
Find a % confidence interval estimate for the population mean delivery time.
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