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Chapter 8: Q 8.31 (page 330)
For what is normal population an abbreviation?
It mean variables are normally distributed.
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Explain why the margin of error determines the accuracy with which a sample mean estimates a population mean.
Find the confidence level and for
a. confidence interval.
b. confidence interval.
Venture-Capital Investments. In Exercise 8.69, you found a confidence interval for the mean amount of all venture-capital investments in the fiber optics business sector to be from million tomillion. Obtain the margin of error by
a. taking half the length of the confidence interval.
b. using Formula on page 325. (Recall that and that million.)
State True or False. Give Reasons for your answers.
The confidence level can be determined if you know only the margin of error, population standard deviation, and sample size.
The margin of error can be determined if you know only the confidence level, population standard deviation, and sample size.
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