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Chapter 8: Q.44 (page 479)

Define the random variable X in words.

Short Answer

Expert verified

The random variable Xindicates the amount of time Americans spend watching television every month.

Step by step solution

01

Given information

Given in the question that, One hundred eight Americans were surveyed to determine the number of hours they spend watching television each month.

02

Explanation

It was revealed that they watched an average of 151 hours each month with a standard deviation of 32 hours. Assume that the underlying population distribution is normal.

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Most popular questions from this chapter

In complete sentences, explain why the confidence interval in Exercise 8.17 is larger than in Exercise 8.18.

Construct a 90% confidence interval for the population mean weight of the heads of lettuce. State the confidence interval, sketch the graph and calculate the error bound.

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.

Which distribution should you use for this problem ?

What will happen to the confidence interval obtained, if 500 newborn elephants are weighed instead of 50? Why ?
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