STAT250_WEEK2

Which of the following would be expected to result in a larger standard error of the mean?

• a. a larger sample size

• b. a smaller sample size

• c. a smaller population standard deviation

• d. a larger population standard deviation

• e. Choices (b) and (d)

Sampling distributions describe the distribution of:

• a. parameters

• b. statistics

• c. both parameters and statistics

• d. neither parameters nor statistics

According to Central Limit Theorem, when the sample size is ………., the distribution of …………is approximately normal.

• a. large, population mean

• b. small, sample mean

• c.large, sample mean

• d.small, population mean

Determine which sampling method is applied.

You wait in the restaurant and apply the survey to every customer who finishes their food.

• a. Quota Sampling

• b. Simple Random Sampling

• c. Convenience Sampling

• d. Systematic Sampling

You ask the current customers about two new and potential customers. You apply the survey to these new people, and ask them to refer you to two new potential customers...

• a.Simple Random Sampling

• b.Systematic Sampling

• c.Snowball Sampling

• d.Quota Sampling

You obtain the list of people living in the region, pick people randomly from this list, and apply them to the survey.

•     a. Simple Random Sampling

• b. Systematic Sampling

• c. Convenience Sampling

• d. Quota Sampling

You obtain the list of people living in the region and pick every 5th person from this list, and apply them to the survey.

• a. Simple Random Sampling

• b. Systematic Sampling

• c. Convenience Sampling

• d. Quota Sampling

Which one is a probability sampling technique?

• a. Convenience Sampling

• b. Quota Sampling

• c. Clustered Sampling

• d. Snowball Sampling

You obtain the list and some demographic info of people living in the region. You separate them by their age into 3 groups: children, teenagers, and adults. Then, you randomly pick people from each of these groups and survey them.

• a. Convenience Sampling

• b. Quota Sampling

• c. Clustered Sampling

• d. Stratified Sampling

What is the formula for calculating the standard deviation of the sampling distribution of a proportion ?

• a. Standard deviation = sqrt(( p_hat * (1 - p_hat)) / n)

• b. Standard deviation = sqrt((p * (1-p)) / n)

• c. Standard deviation = sqrt(p / n)

• d. Standard deviation = sqrt(p_hat  / n)

• e. Standard deviation = sqrt((p_hat *(1-p)) / n-1)