Question

The following data show the number of hours per day 12 adults spent in front of screens watchin 4.3 4.5 7.4 1.3 5.7 4.6 3.4 7.9 2.2 5.1 1.7 8.3 a. Construct a 99% confidence interval to estimate the average number of hours per day adults s The 99% confidence interval to estimate the average number of hours per day adults spend (Round to two decimal places as needed.) b. What assumptions need to be made about this population? O A. The only assumption needed is that the population distribution is approximately normal. O B. The only assumption needed is that the population standard deviation is known. OC. The only assumption needed is that the population distribution is approximately uniform. OD. No assumptions are required.

Answer 1

PAGE No. DATE = 12 solutions a] From the given aampledata, we compute sample mean X=411, samplest olenaton S = 2.3424 & sample size Hereg degrees of freedors are , d. f. =12-1=11 He have to compete 899CiI 1. a = 0.01 Ci-e aigniticaence levels .:: The corticol volue.js, te=3.106 ... The 99% contidence interveel is, CI = (*- to XS__&+texs CScanned with CamScanner үр vo

- C!Io = (4.7 - 31106*2.3424, 4.7+ 3.106% 2.34244 Viz .: C.I; = c 407 - 211, C457-211, 417+211) . CII = c 26,68) Therefore the 99% contidence interrel to estimate the average Dumber of houers per day adults Spened in front of screens Hatching television- related content is from 2.6 hours to 618 bours. 5 The assumptions speed to be made about this population is, A. The only assumption needed is that the popula- tion distai bution is approximately noomal. CScanned with CamScanner