Unit 8 - Sampling Distributions

Question 1

What is a parameter?

Answer 1

A number that describes a population

Question 2

What is a statistic?

Answer 2

A number that describes a sample

Question 3

What is a sampling distribution?

Answer 3

The distribution of a statistic (like p-hat or x-bar) from repeated samples of the same size from a population

Question 4

As the sample size increases, the standard deviation of a sampling distribution _____________

Answer 4

decreases

Question 5

What is the Central Limit Theorem?

Answer 5

For n >30, the sampling distribution will be approx normal EVEN IF the original population is NOT NORMAL

Question 6

If the population is normal, the sampling distribution of sample means will also be ___________ even when n is small

Answer 6

normal

Question 7

If the population is skewed, the sampling distribution of sample means will be normal only if __________

Answer 7

n >30

Question 8

The sampling distribution of sample proportions will only be normal if…

Answer 8

np and nq >10