Statistics 4

Question 1

Bivariate data

Answer 1

Data which has pairs of values for two variables

Question 2

Scatter diagrams

Answer 2

Represent bivariate data

Question 3

Correlation

Answer 3

Describes the nature of the linear relationship between two variables

Question 4

Negative correlation

Answer 4

One variable increases as other decreases

Question 5

Positive correlation

Answer 5

Both variables increase

Question 6

Casual relationship

Answer 6

A change in one variable causes a change in the other (not for all correlations) use context and common sense

Question 7

Linear regression line is a suitable model

Answer 7

When the correlation suggests there is a linear relationship between the variables

Question 8

Interpolation

Answer 8

Making a prediction based on a value that is within the range of the data (likely to be accurate)

Question 9

Extrapolation

Answer 9

Making a prediction based on a value that is outside the range of the data (likely to be less accurate)

Question 10

Predictions using linear regression model

Answer 10

Only for dependent variable
(For independent use alternate regression line