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Chapter 8: Q.63 (page 481)
If it were later determined that it was important to be more than confident and a new survey was commissioned, how would it affect the minimum number you need to survey? Why?
It would decrease, because the -score would decrease, which reducing the numerator and lowering the number.
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122. Stanford University conducted a study of whether running is healthy for men and warner overage . During the first eight years of the study, of the members of the -Plus Fatness Association died. We are interested in the proportion of people over who ran and tied in the same eight-year period.
a. Define the random variablesin words.
b. Which distribution should you use for this problem? Explain your choice.
c. Construct a confidence interval for the population proportion of people average we ran and died in the same eight-year period.
i. State the confidence interval.
ii. Sketch the graph.
iii. Calculate the error bound.
d. Explain what a " confidence interval" means for this study.
Suppose the Census needed to be confident of the population mean length of time. Would the Census have to survey more people? Why or why not?
The data in the Table are the result of a random survey of national flags (with replacement between picks) from various countries. We are interested in finding a confidence interval for the true mean number of colors on a national flag. Let the number of colors on a national flag.
Construct a confidence interval for the true mean number of colors on national flags.
The confidence interval is_____.
Construct a confidence interval for the population mean time spent waiting. State the confidence interval, sketch the graph, and calculate the error bound .
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.
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