A series of free Statistics Lectures in videos.
This is page fourteen of the series of free video lessons, "Statistics Lectures".
Statistics - Lecture 39
If we know that two variables are strongly correlated, we can use one variable to predict the other.
Statistics - Lecture 40
The Spearman correlation is used when:
1. Measuring the relationship between two ordinal variables.
2. Measuring the relationship between two variables that are related, but not linearly.
Statistics - Lecture 41
Correlation vs. Causation
Causation means that one variable causes something to happen in another variable.
To say that two things are correlated is to say that they share some kind of relationship.
In order to imply causation, a true experiment must be performed where subjects are randomly assigned to different conditions.
Researches want to test a new ant-anxiety medication. They split participants into three conditions (0mg, 50mg, and 100mg), then ask them to rate their anxiety level on a scale of 1-10. Are there any differences between the three conditions using alpha = 0.05?
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