Questions from Business Statistics


Q: What fraction of cars made in Japan? The computer output below

What fraction of cars made in Japan? The computer output below summarizes the results of a random sample of 50 autos. Explain carefully what it tells you. z-Interval for proportion With 90.00% confide...

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Q: A study of 902 decisions (to grant parole or not)

A study of 902 decisions (to grant parole or not) made by the Nebraska Board of Parole produced the following computer output. Assuming these cases are representative of all cases that may come before...

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Q: In 2013 the environmental group Oceana (usa.oceana.org

In 2013 the environmental group Oceana (usa.oceana.org) analyzed 1215 samples of seafood purchased across the United States and genetically compared the pieces to standard gene fragments that can iden...

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Q: Using the data from Exercise 56, write up a short report

Using the data from Exercise 56, write up a short report describing the distribution of the number of deaths in the United States from tornadoes during this time period

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Q: A Consumer Reports study similar to the one described in Exercise 31

A Consumer Reports study similar to the one described in Exercise 31 found that 12 of the 22 red snapper packages tested were a different kind of fish. 1. Are the conditions for creating a confidence...

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Q: In a poll taken in December 2012, Gallup asked 1006 national

In a poll taken in December 2012, Gallup asked 1006 national adults whether they were baseball fans; 48% said they were. Almost five years earlier, in February 2008, only 35% of a similar-size sample...

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Q: The Pew Research poll described in Exercise 5 found that 56%

The Pew Research poll described in Exercise 5 found that 56% of a sample of 1060 teens go online several times a day. (Treat this as a Simple Random Sample.) 1. Find the margin of error for this poll...

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Q: The Paralyzed Veterans of America is a philanthropic organization that relies on

The Paralyzed Veterans of America is a philanthropic organization that relies on contributions. They send free mailing labels and greeting cards to potential donors on their list and ask for a volunta...

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Q: First USA, a major credit card company, is planning a

First USA, a major credit card company, is planning a new offer for their current cardholders. The offer will give double airline miles on purchases for the next 6 months if the cardholder goes online...

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Q: An insurance company checks police records on 582 accidents selected at random

An insurance company checks police records on 582 accidents selected at random and notes that teenagers were at the wheel in 91 of them. 1. Create a 95% confidence interval for the percentage of all a...

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