Questions from Essentials of Statistics


Q: We have given the number of successes and the sample size for

We have given the number of successes and the sample size for a simple random sample from a population. In each case, a. use the one-proportion plus-four z-interval procedure to find the required conf...

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Q: A poll by Gallup asked, “If you won 10 million

A poll by Gallup asked, “If you won 10 million dollars in the lottery, would you continue to work or stop working?” Of the 1039 American adults surveyed, 707 said that they would continue working. Obt...

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Q: A Pew Internet & American Life Project examined Internet social networking.

A Pew Internet & American Life Project examined Internet social networking. Among a sample of 929 online adults 18–29 years old, 836 said they use social networking sites. Determine a 95% confidence i...

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Q: In a New York Times article “More Mothers Breast-Feed

In a New York Times article “More Mothers Breast-Feed, in First Months at Least,” G. Harris reported that 77% of new mothers breast-feed their infants at least briefly, the highest rate seen in the Un...

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Q: In the February 2013 article “Offshore Drilling Support High as Deepwater

In the February 2013 article “Offshore Drilling Support High as Deepwater Horizon Oil Spill Trial Opens,” E. Swanson reported on a HuffPost and YouGov poll that asked Americans what they think about i...

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Q: What is meant by saying that a variable has a chi-

What is meant by saying that a variable has a chi-square distribution?

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Q: We have given the number of successes and the sample size for

We have given the number of successes and the sample size for a simple random sample from a population. In each case, do the following. a. Determine the sample proportion. b. Decide whether using the...

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Q: Are the observed frequencies variables? What about the expected frequencies?

Are the observed frequencies variables? What about the expected frequencies? Explain your answers.

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Q: Explain the relationships among the sample proportion, the number of successes

Explain the relationships among the sample proportion, the number of successes in the sample, and the sample size.

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Q: This exercise deals with truncated graphs. a. What is

This exercise deals with truncated graphs. a. What is a truncated graph? b. Give a legitimate motive for truncating the axis of a graph. c. If you have a legitimate motive for truncating the axis of a...

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