Exam 5: Sampling Distributions

A possible concern with convenience sampling is ______.

If you want to sample equally between five locations of your company, you should identify more than five strata.

If we create a distribution of all possible sample means given a particular sample size, we have created a(n) ______.

You want to select a random sample of employees from your organization, but you need to ensure that there are equal proportions of people from each department. Each department would be considered a ______.

A gumball machine has three colours of gumballs. There are 10 red gumballs, 10 blue gumballs, and 20 white gumballs. What is the probability of selecting a red gumball when picking a gumball at random from the machine?

When using convenience sampling, you can never be sure that your sample represents your population.

Explain when convenience sampling should be used. Provide one benefit and one drawback.

In order to use stratified random sampling, you must ______.

In a sampling distribution, what percentage of sample means should fall within ±1 standard error of the population mean?

Consider the sample collected for the survey variable below for Questions. Survey 2 3 3 4 2 4 3 3 3 4 -What is the sample estimate of the standard error of the survey variable?

You want to ensure that the composition of your sample of employees has the same balance of salespeople, customer service representatives, and warehouse workers that your organization has. Your organization has 20 salespeople, 30 customer service representatives, and 50 warehouse workers. If you need 50 total responses to your survey, how many warehouse workers should you ask to respond?

If x̄ = 10 and  = 12, then 2 is the ______.

x̄ appears in the subscript of the population standard error of the mean because it represents ______.

Simple random sampling is the second step of stratified random sampling.

Consider the sample collected for the survey variable below for Questions. Survey 2 3 3 4 2 4 3 3 3 4 -How would you interpret the sample estimate of the standard error you calculated above?

Sampling error should be avoided at all costs.

If 30% of your population works at Plant A, 30% work at Plant B, and 40% work at Plant C, 60 people from Plant A and Plant B should be included in a stratified random sample.

If you wanted to ensure you have an equal number of men and women in your sample, you could use ______.

It is difficult to use a true random sample in real-world settings.

When n > 100, the sampling distribution will likely be normally distributed.