Here is the question

To compare the battery life of two models of tablets , The battery life ( on a single charge ) of 11 tablets from each model is measured . The results are summarized in the following table. Battery Life on Single charge Model4+12-13-8-4 5-1 12-5-7-12 15 13-1.5 Hotel B + tors -95 -718 Battery Life on single charge Chr ) Mean Std Dev Model A- 12. 13 9.5 12.5 12 11 .5 2 Model B-| 10.5 / 9.5 7.5/8.5 /7.5) 10 /9.5 8.5/ 10 9 Assuming both populations are normally distributed . (no other assumptions can be made), can you conclude if Model A has a longer battery life, comparing to Model B ? You should use a p-value approach , when possible . Otherwise (if not possible ) , you are allowed to choose a reasonable significance level