Chapter 8: Q.7 (page 477)
In words, define the random variables and .
Short Answer
is the time in minutes it takes to complete the U.S. Census short form.
is the mean time it took a sample of people to complete the U.S. Census short form.
Chapter 8: Q.7 (page 477)
In words, define the random variables and .
is the time in minutes it takes to complete the U.S. Census short form.
is the mean time it took a sample of people to complete the U.S. Census short form.
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Get started for freeIn one complete sentence, explain what the interval means.
In words, define the random variable .
Suppose average pizza delivery times are normally distributed with an unknown population mean and a population standard deviation of six minutes. A random sample of pizza delivery restaurants is taken and has a sample mean delivery time of minutes.
Find a % confidence interval estimate for the population mean delivery time.
The U.S. Census Bureau conducts a study to determine the time needed to complete the short form. The Bureau surveys people. The sample mean is minutes. There is a known standard deviation of minutes. The population distribution is assumed to be normal.
Identify the following:
a. = _____
b. = _____
c. = _____
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.
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