b and c

Battery life is an important issue for many smartphone owners. Public health studies have examined "low-battery anxiety" and acute anxiety called nomophobia which Its when a smartphone user's phone battery charge runs low and then dies (The Wall Street Journal), Battery life betwe 21 hours when the primary use is talk time and 10 hours when the primary use is Internet applications. Becal the mean hours for talk time usage is greater than the mean hours for Internet usage, the question was raised as to whether the variance in hours of usage Iso greater when battery life between charges for the two applications follows. Primary Use: Talking 35.8 | 21.9 | 23.7 | 32.2 | 18.3 | 42.0 | 27.6 | 23.5 | 29.6 | 22.5 | 20.0 | 35,5 Primary Use: Internet 14.0 | 12.5 | 16.4] 11.9) 9.9 | 32] 54] 11.0) 15.2] 40) 47 Click on the datafile logo to reference the data. DATA Note: Do not round intermediate values. R is sensitive to capitalization. a@. Let o; represent the variance in battery life for talk time and let represent the variance in battery life for internet usage. Choose the null and altemative hypoth you would to test if the population variance in battery life is greater for the talk time application. A.Hoioi? 077, Ha: oi? op b. What are the standard deviations (in hours) of battery life for the two samples? (Round your answers to two decimal places. The standard deviation in hours, when the primary use is talking, is . the standard deviation in hours, when the primary use is internet, is 8 c. Conduct the hypothesis test and compute the p-value. 9 2 0.05 level of significance, what is your conclusion? The test statistic is 3. (Round your answer to two decimal places.) The p-value is . (Round your answer to four dacimal places.) d, Ata 0.05 level of significance, what is your conclusion? ent evidence to reject the null hypothesis. v | ) There is not sui Partially Correct