1. a survey of 400 non fatal accidents showed that 197 involved the use of a cell phone. Construct a 99 percent confidence interval for the proportion of fatal accidents that involved the use of a cell phone

2. a local brewery distributes beer in bottles labeled 12 ounces. A government agency thinks that the brewery is cheating its customers. The agency selects 50 of these bottles measures their contents and obtains a sample mean of 11.7 ounces with a standard deviation of 0.70 ounces. Use a 0.01 significance level to test the agency's clean the the brewery is cheating its customers

3. a recent study claimed that at least 15% of junior high school students are overweight. In a sample of a hundred and sixty students 18 were found to be overweight. At a significance level of 0.05 to test the claim.

4. a manufacturer claims that the mean lifetime of its fluorescent bulbs is 1100 hours. a homeowner soul X 25 bulbs and finds the mean lifetime to be 1070 hours with a standard deviation of 80 hours. Test the manufacturer's claim. Use 0.05 significance level.

5. a telephone company claims that 20 percent of its customers have at least two phone lines the companys selects a random sample of 500 customers and finds that 88 have two or more phone lines. At confidence level 0.05 does the data support the claim? use a p-value.

6. a researcher at aa major hospital wishes to estimate the proportion of the adult population of the United States that has high blood pressure. How large a sample is needed in order to be 95 percent confident that the sample proportion will not differ from the true proportion by more than 4%?

7. a fast food outlet claims the mean waiting time in line is less than three. Four minutes. A random sample of 60 customers has a mean of 3.3 minutes with a standard deviation of 0.6 minute. If level of significance is 0.05 test the fast food outlets clean

8. a local brewery distributes beer in bottles labeled 12 ounces. A government agency thinks that the brewery is cheating its customers. The agency selects 20 of those bottles measures their contents and obtains a sample mean of 11.7 ounces with a standard deviation of 0.7 ounce. Use a 0.01 significance level to test the agency's claim that the brewery is cheating its customers

9. an airline claims that the no-show rate for passengers is less than 5%. In a sample of 420 randomly selected reservations 19 or no shows. At 0.01 significance level test the airlines claim

Subject | Mathematics |

Due By (Pacific Time) | 12/08/2002 11:01 pm |

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