Chapter 8: Q.19 (page 478)
In complete sentences, explain why the confidence interval in Exercise 8.17 is larger than in Exercise 8.18.
A larger confidence level results in larger areas and larger intervals.
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A poll of 1,200 voters asked what the most significant issue was in the upcoming election. Sixty-five percent answered the economy. We are interested in the population proportion of voters who feel the economy is the most important.
Define the random variable P′ in words.
Which distribution should you use for this problem?
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.
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 weight of the heads of lettuce. State the confidence interval, sketch the graph and calculate the error bound.
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