Select all of the following statements which are true. In a...

Select all of the following statements which are true. In a randomized experiment, researchers can make cause-and-effect conclusions. A convenience sample using a sample size of 1000 would be preferred to a random sample with a sample size of only 200. The response variable will always be observed, never assigned, regardless of study design. Online polls typically result in non-response bias. A confounding variable must be related to the response variable, but not the explanatory variable. Non-random samples are usually poor representations of the population.

Transcript

00:01 Hey there, welcome to numerade.

00:03 We are asked to write down the statements that are true.

00:08 So choose the following choices, more than one, that are true.

00:13 So when we think of our randomized experiment, i'm going to label this as part choice a.

00:22 We have a randomized experiment where this statement says that it can make a.

00:39 Cause and effect conclusions.

01:01 So this statement here would be, right, that a randomized experiment can conclude a cause and effect relationship in this case.

01:16 All right.

01:17 So for the reason that there are no other variables that can impact the relationship.

01:25 So we can conclude it's cause and in fact.

01:30 All right.

01:31 So let's try part b over here.

01:38 So for part b we have a convenience sample using a sample size of 1 ,000.

01:46 So convenience sample with a sample size here of 1 ,000 would be preferred to a random sample with a sample size of only 200.

02:07 So this one would be false.

02:11 So let us explain over here.

02:13 A larger sample size is generally preferred to a smaller sample size, but a convenience sample here is not preferred over a random sample.

02:28 So basically what we have here, that a random sample will be preferred over convenience.

02:36 That's why it is false.

02:39 Okay.

02:41 Choice c.

02:44 Choice c, the response variable will always be observed.

02:55 Response variable will always be observed...

Question

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