Your statistics instructor wants you to determine a confidence interval estimate for the mean test score for the next exam. In the past, the test scores have been normally distributed with a mean of 74.2 and a standard deviation of 30.9. A 95% confidence interval estimate if your class has 30 students is:

Preliminary study the population standard deviation : A consumer agency has retained an independent testing firm to examine a television manufacturer's claim that its 25-inch console model consumes just 110 watts of electricity. |

Favor of the airlines e-mail idea : An airline has surveyed a simple random sample of air travelers to find out whether they would be interested in paying a higher fare in order to have access to email during the flight. |

Confidence and the estimated standard deviation : The Arkansas State Police wish to estimate the average mph being traveled on the Interstate Highways,which cross the state.If the estimate is to be within 8 mpg of the true mean with 98% confidence and the estimated standard deviation is 22 mph,how l.. |

Confidence interval for the population mean would equal : A random sample of size 15 taken from a normally distributed population revealed a sample mean of 75 and a sample variance of 25. The upper limit of a 95% confidence interval for the population mean would equal? |

Determine a confidence interval estimate : Your statistics instructor wants you to determine a confidence interval estimate for the mean test score for the next exam. In the past, the test scores have been normally distributed with a mean of 74.2 and a standard deviation of 30.9. A 95% confi.. |

Different from their counter-parts across the nation : The International Coffee Association has reported the mean daily coffee consumption for U.S. residents as 1.65 cups.Assume that a sample of 38 people from a North Carolina city consumed a mean of 1.84 cups of coffee per a day, with a standard deviati.. |

Determineand interpret the p-value for the test : For a sample of 12 items from a normallydistributed population for which the standard deviation is σ =17.0, the sample mean is 230.8. At the 0.05 level of significance,test Hο : μ ≤ 220versus H 1 : µ > 220. Determineand interpret the p-value for the .. |

Job hunting during the month preceding the survey : Based on its 1999 survey,Student Monitor reports that 20% of U.S. college students used the internet for job hunting during the month preceding the survey. Assuming this finding to be based on a simple random sample of 1600 college students, construc.. |

Approximate location of rejectionregion for the test : For each of the following statements,formulateappropriate null and alternative hypotheses. Indicate whether theappropriate test will be one -tail or two-tail,then sketch adiagram that shows the approximate location of the rejectionregion(s) for the t.. |

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