Statistics for Decision-Making Submit Quiz Time Remaining: 01:22:54 Quiz: Week 7

Question

Statistics for Decision-Making Submit Quiz Time Remaining: 01:22:54 Quiz: Week 7 Quiz 5of19 (3 complete) This Quiz: 60 pts possible This Question: 3 pts People were polled on how many books they read the previous year. How many subjects are needed to estimate the number of books read the previous year within one 18 7 books. book with 90% confidence? Initial survey results indicate that A 90% confidence level requres subpects (Round up to the nearest whole number as needed ) Enter your answer in the answer box. ype here to search

Explanation / Answer

Solution:-

=> A 90% confidence interval requires 946 subjects

Explanation:- Formula : n = (Z*s/E)^2
by given E = 1 , 90% confidence interval of Z = 1.645 , S = 18.7

n = (1.645*18.7/1)^2 = 946.2698

n = 946

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