Jessica Salas, President of Salas Products, is reviewing the warranty policy for her company's new model of automobile batteries. Life tests performed on a sample of 100 batteries indicated: (1) an average life of 75 months, (2) a standard deviation of 5 months, and (3) a bell-shaped battery life distribution. What percentage of the batteries will fail within the first 65 months of use?

Q: (d) two-tailed test, df = 14, t = -1.7

A: (d) df=14, t=-1.7 Two tailed

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A: Given a sampling distribution of the sample mean for a continuous population from artofstat.com.Here…

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A: Mean() = 270Standard deviation () = 22

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A: The data (X) for n=12 are : 15, -5,14, 8, -1,10, -6, 1, 0, 4, -3 ,9 , =3.8333 = s= =7.247

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A: f(x,y)=ce-8x-5y ; 0< y<x

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A: From the provided information,Number of explanatory variables (k) = 2Observations (n) = 23

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A: Given that,To find the 78th percentile.

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A: The data is defined below as follows:  From the information, given that

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A:

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A:

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A: MonthsCostumers1103211331234125514961447151816591781019211202122001311014114151161613417132

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