As part of a study of grade inflation, you want to estimate the mean grade point average of all current college students in the United States. All grad point averages are to be standardized for a scale between 0 and 4. How many grade point averages must be obtained so that the sample mean is within 0.2 of the population mean? Assume that a 99% confidence level is desired. Also assume that a pilot study showed that the population standard deviation is estimated to be 0.79. Does it make sense to collect the entire sample at your college?

Cell phone and Brain Cancer

In a study of 420,095 cell phones users in Denmark, it was found that 135 developed cancer of the brain or nervous system. We therefore expect about 143 cases of such cancers in a group of 420,095 randomly selected people. Estimate the probability of 135 or few cases of such cancers in a group of 420,095 people. What do these results suggest about media reports that cell phones cause cancer of the brain or nervous system?

Subject | Mathematics |

Due By (Pacific Time) | 11/19/2014 10:36 pm |

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