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How does the time period or number of variables effect correlation coefficient?
The time period may not affect the correlation coefficient at all. If looking at the correlation between the mass and volume of steel objects, time is totally irrelevant. The effect of the number of variables depends on whether or not the extra variables are related to ANY of the variables in the equation.
What is the ability to neutralize the effect of one variable in order to assess the relationship between two other variables?
makeing the correlation spurious
What is the method used to demonstrate a cause and effect relationship between two variables?
Ah, the method used to show a cause and effect relationship between two variables is through experimentation, my friend. You see, by manipulating one variable and observing the effect on the other, we can understand how they are connected. Just like painting a happy little tree, it's all about exploring and learning from the beautiful relationships in the world around us.
A test of the effect of a single variable by changing it while keeping all other variables the same?
controlled experiment
What is moderating variable?
Moderation occurs when the relationship between two variable depends on a third variable. The third variable is referred to as the moderate variable or simply the moderator
