Rick O\'Shea is a candidate for governor of a big state. To get the latest voter

Question

Rick O'Shea is a candidate for governor of a big state. To get the latest voter opinion poll, his campaign organization obtains a random sample of 600 likely voters. The poll shows that 53% of voters in the sample would vote for Rick O'Shea. Allowing a 95% confidence level, what is the margin of error for the poll result?

a. 0.040

b. 0.036

c. 0.032

d. 0.029

Rick O’Shea asks his campaign manager to obtain a poll with a margin of error of 2 percentage points and error probability of 5%. What is the sample size required to obtain a 2 percentage point margin of error? Use 50 percent for planning value.

a. 2260

b. 2306

c. 2353

d. 2401

Rick O'Shea is a candidate for governor of a big state. To get the latest voter opinion poll, his campaign organization obtains a random sample of 600 likely voters. The poll shows that 53% of voters in the sample would vote for Rick O'Shea. Allowing a 95% confidence level, what is the margin of error for the poll result?

a. 0.040

b. 0.036

c. 0.032

d. 0.029

Rick O’Shea asks his campaign manager to obtain a poll with a margin of error of 2 percentage points and error probability of 5%. What is the sample size required to obtain a 2 percentage point margin of error? Use 50 percent for planning value.

a. 2260

b. 2306

c. 2353

d. 2401

Explanation / Answer

a) For 95% interval Critical value will be 1.960

Margin of error = 1.960*sqrt(0.53*0.47/600) = 0.040

Correct option is A

b) Minimum size sample will be = ((1.960/0.02)^2)*0.50*0.50 = 2401

So, Correct option is D

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