Unit 3 - Topic 2 - Experimentation - Section E - Presentation of Data

Question 1

What do discrete and continuous variables give rise to

Answer 1

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

Question 2

What is qualitative data

Answer 2

Qualitative data is subjective and descriptive

Question 3

How can quantitative data be measured

Answer 3

Quantitative data can be measured objectively, usually with a numerical value

Question 4

What does ranked data refer to

Answer 4

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

Question 5

What does the type of variable being investigated have consequences for graphical display

Answer 5

The type of variable being investigated has consequences for any graphical display or statistical tests that may be used

Question 6

What is correlation

Answer 6

Correlation is an association and does not imply causation. 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

What is a 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

What is a 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

What is the strength of correlation

Answer 9

Strength of correlation is proportional to spread of values from line of best fit