3.2e Presentation of data

Question 1

Discrete/continuous

Answer 1

Discrete and continuous variables give rise to qualitative, quantitative or ranked data.

Question 2

Qualitative Data

Answer 2

Is subjective and descriptive.

Question 3

Quantitative Data

Answer 3

Can be measured objectively, usually with a numerical value.

Question 4

Ranked data

Answer 4

Refers to the data transformation in which the numerical values are replaced by their rank when the data are sorted from lowest to highest.

Question 5

Correlation

Answer 5

Correlation is an association and does not imply causation.

Question 6

Causation

Answer 6

Causation exists if the changes in the values of the independent variable are known to cause changes to the value of the dependent variable.

Question 7

Positive correlation

Answer 7

A positive correlation exists when an increase in one variable is accompanied by an increase in the other variable.

Question 8

Negative Correlation

Answer 8

A negative correlation exists when an increase in one variable is accompanied by a decrease in the other variable.

Question 9

Strength of correlation

Answer 9

The strength of correlation is proportional to spread of values from line of best fit. Correlation values are not required.