Doing research for insurance rates, it is found that those aged 30 to 49 drive an average of 38.7 miles per day with a standard deviation of 6.7 miles. These distances are normally distributed. If a group of 60 drivers in that age group are randomly selected, what is the probability that the mean distance […]
Construct a Confidence Interval with given the sample mean and the sample standard deviation. Assume the population is normally distributed and use the t-distribution to find the margin of error and construct a 95% confidence interval for the population mean. Interpret the results. a) In a random sample of five people, the mean driving distance to […]
Mobile Device Repair Costs researcha) In a random sample of 12 mobile devices, the mean repair cost was $90.42 and the standard deviation was $33.61. b) You research repair costs of mobile devices and find that the population mean is $89.56. In a), does the t-value fall between -t95 and t0.95? Looking for a […]
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