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DEFINE CONFIDENCE INTERVAL FOR μ WHEN σ IS NOT KNOWN?
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In the introductory case of this chapter, Jared Beane wants to estimate the mean mpg for all ultra-green cars. Table 8.1 lists the mpg of a sample of 25 cars. Use this information to construct the 90% confidence interval for the population mean. Assume that mpg follows a normal distribution.
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Let us revisit Example, where Jared Beane wants to construct the 90% confidence interval for the mean mpg of all ultra-green cars. Suppose Jared would like to constrain the margin of error to within 2 mpg. Further, Jared knows that the minimum mpg in the population is 76 mpg, whereas the maximum is 118 mpg. How large a sample does Jared need to compute the 90% confidence interval for the population mean?
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WHAT IS THE REQUIRED SAMPLE SIZE WHEN ESTIMATING THE POPULATION PROPORTION?
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Let us revisit Example, where Jared Beane wants to construct the 90% confidence interval for the proportion of all ultra-green cars that obtain over 100 mpg. Jared does not want the margin of error to be more than 0.10. How large a sample does Jared need for his analysis of the population proportion?
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WHAT IS POPULATION VERSUS SAMPLE?
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What is bias?
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Define selection bias?
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