Chapter 8: Q 8.115. (page 342)
For a curve with , use Table IV to find each value.
a.
b.
c.
Short Answer
Part (a)
part (b)
Part (c)
Chapter 8: Q 8.115. (page 342)
For a curve with , use Table IV to find each value.
a.
b.
c.
Part (a)
part (b)
Part (c)
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Get started for freeThe margin of error can be determined if you know only the confidence level, population standard deviation, and sample size.
Class Project: Gestation Periods of Humans. This exercise can be done individually or, better yet, as a class project. Gestation periods of humans are normally distributed with a mean of days and a standard deviation of 16 days.
a. Simulate samples of nine human gestation periods each.
b. For each sample in part (a), obtain a confidence interval for the population mean gestation period.
c. For the confidence intervals that you obtained in part (b), roughly how many would you expect to contain the population mean gestation period of days?
d. For the confidence intervals that you obtained in part (b), determine the number that contain the population mean gestation period of days.
e. Compare your answers from parts (c) and (d), and comment on any observed difference.
Military Assistance Loans. The annual update of U.S. Overseas Loans and Grants, informally known as the "Greenbook," contains data on U.S. government monetary economic and military assistance loans. The following table shows military assistance loans, in thousands of dollars, to a sample of countries, as reported by the U.S. Agency for International Development.
State True or False. Give Reasons for your answers.
The confidence level can be determined if you know only the margin of error.
We provide a sample mean, sample size, and population standard deviation. In each case, perform the following tasks.
a. Find a 95% confidence interval for the popularion mean. (Note: You may want to review Example 8.2, which begins on page 316.)
b. Identify and interpret the margin of error:
c. Express the endpoints of the confidence interval in terms of the point estimate and the margin of error.
where,
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