Correlation

Question 1

Define correlation

Answer 1

If there is a link between two variables

Question 2

Define positive correlation

Answer 2

When one variable increases the other also increases

Question 3

Define negative correlation

Answer 3

When one variable increase the other decreases

Question 4

Define no correlation

Answer 4

No relationship between the variables

Question 5

Give an advantage and disadvantage of correlations

Answer 5

A- useful in new areas of research, when you want to find out if two variables are linked before you design experiments to investigate cause and effects
-easy to analyse visually by drawing a scattergraph-its easy to see if there is a correlation, direction and any outliers

D- can’t tell if one variable causes an effect on the other
-can’t tell which variable causes the other or if a completely separate variable you haven’t measured is influencing your two co-variables

Question 6

Correlation hypothesis: define null hypothesis

Answer 6

No significant correlation between the variables

Question 7

Correlation hypothesis: define alternate hypothesis

Answer 7

There will be a significant correlation between the variables

Question 8

Correlation hypothesis: define one tailed correlation hypothesis

Answer 8

There will be a significant correlation (positive/negative) between the variables

Question 9

Correlation hypothesis: define two tailed correlation hypothesis

Answer 9

Not stating whether it is a positive or negative correlation between the variables