Mathematics, 13.11.2019 01:31, Imthiccasf
National fuelsaver corporation manufactures the platinum gasaver, a device they claim "may increase gas mileage by 22%." here are the percent changes in gas mileage for 15 identical vehicles, as presented in one of the company's advertisements:
48.3 46.9 46.8 44.6 40.2 38.5 34.6 33.7
28.7 28.7 24.8 10.8 10.4 6.9 -12.4
would you recommend use of a t confidence interval to estimate the mean fuel savings in the population of all such vehicles? explain your answer.
Answers: 3
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The table shows the webster family’s monthly expenses for the first three months of the year. they are $2,687.44, $2,613.09, and $2,808.64. what is the average monthly expenditure for all expenses?
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