MATH 115-A02 Summer 2017 atteriee Homework: Customized Review for Quiz 8 Score:

Question

MATH 115-A02 Summer 2017 atteriee Homework: Customized Review for Quiz 8 Score: 0.83 of 1 pt 150, 15(15completel HYV Score: 88.89%, 13.33 of 1: Question Help 12.3.37 Two brands ofear batteries, bot,arryrg 6year warranse, wem sarpled and litid under under controlled conditions. Five of each brand failed ater e number of monthe shown. Calaulate a) both sample means and bj both Decide c)which brand batery lasts longer and d) which brand has the more consistent Metime Brand Ann, 64, 64, 68 Brand B: 65, G9, 67, 66, 6:3 )What are the sample means? 68.8 b) What are the sample standand deviatiors? A-5.07 (Round to the nearest hundredth as needed -0 Enter your answer in the edit fieids and then click Check Answer Clear All

Explanation / Answer

a) Mean of Brand A = 68.8.

Mean of Brand B = 65.8.

b) Standard deviation of Brand A = 5.07.

Standard deviation of Brand B = 2.28.

c) Since mean lifetime of Brand A is higher than mean lifetime of Brand B, so Brand A lasts longer. (Ans).

d) Since standard deviation of Brand B is lower than standard deviation of Brand A, so Brand B has more consistent lifetime. (Ans).

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