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Chapter 8: Q 8.1. (page 319)
The value of a statistic used to estimate a parameter is called a ______ of the parameter.
The value of a statistic used to estimate a parameter is called a point estimate of the parameter.
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Assume that the population standard deviation is known and decide weather use of the -interval procedure to obtain a confidence interval for the population mean is reasonable. Explain your answers.
The sample data contain outliers, and the sample size is.
Northeast Commutes. Refer to Exercise
a. Determine and interpret a upper confidence bound for the mean commute time of all commuters in Washington, DC.
b. Compare your one-sided confidence interval in part (a) to the (twosided) confidence interval found in Exercise
State True or False. Give Reasons for your answers..
The confidence interval can be obtained if you know only the margin of error.
Poverty and Dietary Calcium. Refer to Exercise 8.70.
a. Find a confidence interval for .
b. Why is the confidence interval you found in part (a) shorter than the one in Exercise 8.70?
c. Draw a graph similar to that shown in Fig on page 326 to display both confidence intervals.
d. Which confidence interval yields a more accurate estimate of ? Explain your answer.
The margin of error can be determined if you know only the confidence level, population standard deviation, and sample size.
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