Question

# An important feature of modern tablets is battery life. Here, we wish to compare how tow...

An important feature of modern tablets is battery life. Here, we wish to compare how tow popular tablets brands perform in this area. You collect a sample of 16 Ipad tablets and 13 Surface tablets. The ipad sample had a mean of 600 minutes of battery life, with a standard deviation of 6.88 minutes. Meanwhile, the Surface sample had a mean of 625 minutes and a standard deviation of 6.03 minutes. We wish to know if the Ipad tablets have a higher variance in battery life than the Surface tablets. Battery life has a normal distribution in both populations, and you are asked to use α = 0.05.

#### Homework Answers

Answer #1

i am denoting the ipad tablets by group 1 and surface tablets by group 2.

given data are:-

hypothesis:-

[ claim ]

the test statistic be:-

df1 = (n1-1) = (16-1) = 15, df2 = (n2-1) = (13-1) = 12,

the p value = 0.3266

[ in any blank cell of excel type =F.DIST.RT(1.3018,15,12) ]

decision:-

p value = 0.3266 > 0.05(alpha)

we fail to reject the null hypothesis. There is not enough evidence to claim that , the Ipad tablets have a higher variance in battery life than the Surface tablets.

*** if you have any doubt regarding the problem ,please write it in the comment box...if satisfied,please UPVOTE.

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