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Chapter 8: Q.7 (page 477)

In words, define the random variables X and X¯.

Short Answer

Expert verified

Xis the time in minutes it takes to complete the U.S. Census short form.

X¯is the mean time it took a sample of 200people to complete the U.S. Census short form.

Step by step solution

01

Given Information

The random variablesXandX¯.

02

Explanation

A random variable is a numerical representation of a statistical experiment's outcome.

According to the information

Xis the time in minutes it takes to complete the U.S. Census short form.

X¯is the mean time it took a sample of 200people to complete the U.S. Census short form.

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Most popular questions from this chapter

The mean age for all Foothill College students for a recent Fall term was 33.2. The population standard deviation has been pretty consistent at 15. Suppose that twenty-five Winter students were randomly selected. The mean age for the sample was 30.4. We are interested in the true mean age for Winter Foothill College students. Let X=the age of a Winter Foothill College student.

As a result of your answer to Exercise 8.26, state the exact distribution to use when calculating the confidence interval.

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Construct a 95% confidence interval for the population proportion of households where the women make the majority of the purchasing decisions. State the confidence interval, sketch the graph and calculate the error bound.

Suppose 250randomly selected people are surveyed to determine if they own a tablet. Of the 250surveyed, 98reported owning a tablet. Using a95% confidence level, compute a confidence interval estimate for the true proportion of people who own tablets

The mean age for all Foothill College students for a recent Fall term was 33.2. The population standard deviation has been pretty consistent at 15. Suppose that twenty-five Winter students were randomly selected. The mean age for the sample was 30.4. We are interested in the true mean age for Winter Foothill College students. Let X=the age of a Winter Foothill College student.

role="math" localid="1648389122287" n=____
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