Unit 10 Quiz: Review questions

Can you explain your answer? Use your fingers to indicate your answer: 1=A, 2=B, 3=C, 4=D. After viewing the question, show me your answer in 15 seconds. Next, turn to your neighbor and you have one minute to convince him/her that you are right.

“A sampling distribution is a distribution of the means “A sampling distribution is a distribution of the means. You obtain a sample from the population, compute the mean, put the sample back and repeat the same process many times. Afterwards, you get a sampling distribution.” Is it a good definition of sampling distribution? Yes No

CNN did a poll to show the approval rating of Trump CNN did a poll to show the approval rating of Trump. The sample size is 1,000. A critic said that this poll is invalid because this sample is a very small portion of the entire US population. Is he right? Yes No

We need at least 30 subjects to create a normal sampling distribution We need at least 30 subjects to create a normal sampling distribution. Is it right? Yes No

Which of the following distribution is more likely to produce a normal sampling distribution? Skewed Uniform Bimodal All of the above

When we infer from the sample to the population, what is the ideal? unbiased estimation, high variance unbiased estimation, low variance systematic estimation, high variance systematic estimation, low variance