Cause & Correlation

What are the three reasons why variables may be correlated?

Correlation and Causation

Which one of the six different variations of the causes for the relationship between correlation and causation is false? a. two variables may be correlated because x casues y b. two variables may be correlated because y causes x c. two variables may be correlated because of an implied causation between x and y d. two variables may be correlated because they interact e. two variables may be correlated because of a lurking variable f. two variables may be spuriously related

Athletes Standard Error

If 25% of Kalamazoo College consists of athletes, and there are 1,200 students surveyed; what will be the standard error of the survey.

Standard Deviation Practice

List below are two data sets. Please calculate the sample variance and the standard deviation for each:

x		y
51		64
36		49
89		76
47		78
76		45
12		32
25		16
38		42
94		86

Advantages and Disadvantages

What are the advantages and disadvantages of the mean?

The Mode

What are the disadvantages and advantages of the Mode?

Population Studies Question

Give 2 reasons statisticians do not conduct population studies and give 2 reasons why population studies are useful.