Answered: On average, a car battery lifespan in…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Transcribed Image Text:c) A manufacturer of Brand A claims that their battery will last more than 2.5 years. Test at 5% significance level to support the claims.

Transcribed Image Text:On average, a car battery lifespan in Malaysia ranges from two to five years. It could be affected by the battery brand, vehicle type, area's climate, car care, and driving pattems. A researcher is interested to compare the car battery lifespan between two types of brands. The statistics of two brands of batteries are given in the following table. Brand A Brand B Sample mean Sample variance Sample size 2.8 3.1 1.2 1.5 10 12 Assume that the populations are approximately normally distributed. a) Construct a 90% confidence interval for the ratio of two variances of battery lifespan between Brand A and Brand B. Identify whether the two variances are equal or unequal. b) Based on your answer in a), test at 5% significance level whether there is a significant difference on the mean lifespan between Brand A and Brand B.

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