Question
Quiz: W2: Assignment 3 Quiz survey of 1017 peopie, 71d sad thal Tvey voled in the election bs thes resun consesienk wth the sumeut, or s (hes res appear that accurate waling siats can be oteaned by iniking volrs how thry ace? sn oty to oour with aned ot rso why o hy siret in hee mss on t -12 14 (Round to one decimal place as neoded.j b. is the resul of 714 vong r, e esection usua·or umeuar? O A. This resut ts nusual because 714 & below the minu e walue B. This result is unusu" because 7145 within the range of O c. This result is unusual because 714 s greater han the masimum uveat va O D. Thhs resut is usuat because 714 is wthin the sange of usual vakues rvcial w c. Does it appear thar acurate votng eesuts can be obtsned ty asking vobers terw they acledr) Click to select your answerls) O Type here to search
Explanation / Answer
a)
Mean =n*p = 1017 *(0.72) =732.24 = 732.2 [rounded to one decimal]
SD =[np(1-p)] = [1017 *(0.72)(1-0.72)] =14.3188 = 14.3 [rounded to one decimal]
b)
z= (714 -732.2)/14.3
= -1.27
since it is less than -2 SD, it is usual.
Option D is correct
c)
No, because it appears that substantially fewer people say that they voted than the proportion of people who actually did vote