4) Find the sample size needed to be able to estimate the proportion of students

Question

4) Find the sample size needed to be able to estimate the proportion of students that support (low volume) light azz played during exams to within 5% at the 95% confidence level. Use the estimated value of 56% support of light jazz. Sample Size Needed Find the sample size needed to estimate the average calories in Halloween candies to within 10 calories at the 95% confidence level. Assume a known estimate for the standard deviation of the population is 23.8 calories. (3 pts each) Extra Credit: Sample Size Needed

Explanation / Answer

Lets calculate the n:

MOE = .05 <= 1.96*sqrt( .56*.44/n)

Reshufling:

n >= 1.96*^2* (.56*.44/.05)^2

n >= 95.2

So, the size of the sample must be 96 atleast so that MOE is within .05

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