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Chapter 8: Q.92 (page 483)
Using the same p鈥� and level of confidence, suppose that n were increased to 100. Would the error bound become larger
or smaller? How do you know?
The error bound will become smaller.
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Suppose the marketing company did do a survey. They randomly surveyed households and found that in of them, the woman made the majority of the purchasing decisions. We are interested in the population proportion of households where women make the majority of the purchasing decisions.
Identify the following:
a. ______
b. ______
c. ______
Construct a confidence interval for the population mean time spent waiting. State the confidence interval, sketch the graph, and calculate the error bound .
Suppose we know that a confidence interval is (). Find the error bound and the sample mean.
In a recent sample of used car sales costs, the sample mean was with a standard deviation of . Assume
the underlying distribution is approximately normal.
a. Which distribution should you use for this problem? Explain your choice.
b. Define the random variablein words.
c. Construct a confidence interval for the population mean cost of a used car.
i. State the confidence interval.
ii. Sketch the graph.
iii. Calculate the error bound.
d. Explain what a 鈥� confidence interval鈥� means for this study.
Construct a confidence interval for the population mean time to complete the forms. State the confidence interval, sketch the graph and calculate the error bound.
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