Chapter 8: Q.45 (page 479)
Define the random variable in words.
Short Answer
represents the sample mean.
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Chapter 8: Q.45 (page 479)
Define the random variable in words.
represents the sample mean.
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A student polls his school to see if students in the school district are for or against the new legislation regarding school uniforms. She surveys students and finds that are against the new legislation.
a. Compute a % confidence interval for the true percent of students who are against the new legislation, and interpret the confidence interval.
b.In a sample of students,% said they own an iPod and a smartphone. Compute a % confidence interval for the true percent of students who own an iPod and a smartphone.
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 to complete the forms. State the confidence interval, sketch the graph and calculate the error bound.
If the Census did another survey, kept the error bound the same, and surveyed only people instead of , what would happen to the level of confidence? Why?
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.
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