Search for tag: "mean"

This video introduces the concept of matching participants. Sometimes random assignment is impossible, which increases the selection threat to internal validity. One way to mitigate this threat is to…

In this video Matthijs guides you through a step-by-step plan that you can use for hypothesis testing (significance testing) for means and proportions.

In this video Matthijs explains how to do a hypothesis test (significance test) for means.

This video explains what the sampling distribution is. This distribution is important, because it is the link that helps researchers to draw conclusions about a population on the basis of only one…

This video explains how to calculate the mean of a probability distribution. You also learn what happens with the mean when adjusting a random variable or when combining different random variables.

In this video Matthijs discusses an example in which he uses all the core elements of this module. In the example, your data matrix contains the average grades in chemistry of 8 high schools.…

Next to summarizing a distribution by means of graphs, it can also be useful to summarize the center of your distribution. In this video Matthijs discusses three main ways to do this: the mode, mean…

This video explains how to compare two independent groups on a quantitative variable, using a t-test for two independent means. You also learn how to calculate the corresponding confidence interval.

This video introduces the concept of matching participants. Sometimes random assignment is impossible, which increases the selection threat to internal validity. One way to mitigate this threat is to…