This feature of our site requires you to log in or register. You have to be a registered user to answer this question! in order to failry set flat rates for auto mechanics, a shop foreman needs to estimate the average time it takes to replace a fuel pump in a car. Round your answer to the nearest hundredths.ī.Find a 95% confidence interval for the population mean . Assume that the population is normally distributed.Ī.Find the margin of error for a 95% confidence interval. In a random sample of 26 computers, the mean repair cost was $130 with a sample standard deviation of $36. How large a sample must he select if he wants to be 99% confident that the true average time is within 15 minutes of the sample average? Assume the standard deviation of all times is 30 minutes.ģ. Round your answer to the nearest tenths.ī.Construct a 95% confidence interval for the mean score, of all bowlersĢ.In order to fairly set flat rates for auto mechanics, a shop foreman needs to estimate the average time it takes to replace a fuel pump in a car. The population standard deviation is known to be 8.Ī.Find the margin of error E for a 95% confidence interval. A group of 40 bowlers showed that their average score was 192.
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