A pollster is interested in gauging how a given state’s Governor would perform i
ID: 3045398 • Letter: A
Question
A pollster is interested in gauging how a given state’s Governor would perform in his home state if he ran for President. The pollster randomly selects a sample of voters from a list of all eligible voting citizens in that state. Because nearly 75% of the state’s voters claim a party affiliation (e.g. Democrat, Republican), the pollster decides to include approximately 25 non-affiliated voters for every 75 affiliated voters in his sample.
A. Simple Random Sampling
B. Stratified Sampling
C. Non-random Sampling
D. None of the Above
A call center manager wants to measure customer fulfillment order time. She estimates the call lengths to be 5.75 minutes with a standard deviation of 7.00 minutes. She want to be +/- 1 percent in her sampling error. At 95% confidence in her results, what should the sample size be? Show your work.
Explanation / Answer
Solutionb:
Stratified sampling refers to a type of sampling method . With stratified sampling, the researcher divides the population into separate groups, called strata. Then, a probability sample (often a simple random sample ) is drawn from each group
ANSWER"Stratified sampling
A call center manager wants to measure customer fulfillment order time. She estimates the call lengths to be 5.75 minutes with a standard deviation of 7.00 minutes. She want to be +/- 1 percent in her sampling error. At 95% confidence in her results, what should the sample size be? Show your wo
z crit for 95%=1.96
sample size=n=(Z sigma/E)^2
=(1.96*7/1)^2
=188.2384
=188
Required sample size=188