Correlations, averages and dispersion

Question 1

What is a correlation?

Answer 1

-A relationship or association between two variables.

Question 2

What is a positive correlation?

Answer 2

-Where both variables increase together.

Question 3

What is a negative correlation?

Answer 3

-Where one variable decreases in value as the other increases.

Question 4

How are correlations normally visualised?

Answer 4

-With a scatter graph and sometimes a line of best fit.

Question 5

How is a mean calculated?

Answer 5

-Add up all off the values and divide by the original number of results.

Question 6

How is a median calculated?

Answer 6

-Arrange all results in order and see which result is in the middle (if there are two values, find the mean of them)

Question 7

How is a mode calculated?

Answer 7

-See which value occurs the most.

Question 8

How is a range calculated?

Answer 8

-Subtract the smallest result from the largest result. (in psychology we add one for some reason)

Question 9

What is standard deviation?

Answer 9

-How far results vary from the mean.

Question 10

How is standard deviation calculated?

Answer 10

• Either: subtract the mean value from the highest value.

- Or: subtract the lowest value from the mean value.