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Point estimate for difference in average talktime

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Reference no: EM131319457

A smartphone company has to decide which battery they will use for their upcoming model. Two battery manufacturers A and B are competing to get the contract. 15 smartphones of the upcoming model were tested with batteries from A. The dataset of talktime on a single charge for them has a sample mean of 7.2 hours and sample variance of 2.7. 31 smartphones of the upcoming model were tested with batteries from B. The talktime on a single charge for them has a sample mean of 6.8 hours and sample variance of 2.9. Assume that the talktime on a single charge for batteries made by A and B are Normal random variables. Based on this information, answer the following two questions.

(a) Compute a point estimate for difference in average talktime of battery A and battery B.

(b) Test whether the battery produced by A results in longer talktime, on average, than battery produced by B. Choose level = 5%.

Reference no: EM131319457

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