Score: 0 of 1 p 6.3.17- 7of9(6complete) HIV Score: 66 67%, 6019p Question Help A

Question

Score: 0 of 1 p 6.3.17- 7of9(6complete) HIV Score: 66 67%, 6019p Question Help A esnarchor wishes to ewh 9s conlidence, te paguiaticn propotion of adts who think the a) preliniary estimate is avalie Find te mirinmm sample we needed of aduts who think the prosident of their country can conteal the price of gaoline Her eslimate must be accurate thi ang a prior study tat found that 46% of the respondents said they think their president can contrase price of c) Compare the results from parts (a) and () (a) What is the minimum sample size needed assuming hait no prlor Ieformation is available? n103(Round up to the nearest whole number as nede )whatthe meiman sample size needed using a prior saidythat found that 46% ofthe respondents said they fink their president can control the pie of gasoine? 3 Rlound up to the nearest whole mamber as needed) (c) How do the sesuls from () and (b) cmpare OA. Having an "inute offupopuAkr, proportion has no eted en meimum sample sce needed O B. Having an estimate of the population proporition raises the minimum sample size neede O C. Having an esimate of the population propartion reduces the minimam sample size needed Cick to select your answer and then cck Check Anw

Explanation / Answer

Solution:-
a) "no preliminary estimate is available" so assume that p = 0.5

n = p(1-p)(z/E)^2

n = 0.5(1-0.5)(2.575/0.04)^2

n = 1036.03

n = 1036

b)Now we are told that p = 0.46

n = p(1-p)(z/E)^2

n = 0.46(1-0.46)(2.575/0.04)^2

n = 1029.4045

n = 1029

c) option C. Having an estimate of the population proportion reduces the minimum sample size needed

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