3.2.5 presentation of data

Question 1

what do discrete and continuous variables give rise to

Answer 1

qualitative, quantitative or ranked data

Question 2

what is qualitative data

Answer 2

subjective and descriptive

Question 3

what is quantitative data

Answer 3

this can be measured objectively, usually with a numerical value

Question 4

what does rank data refer to

Answer 4

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

Answer 5

any graphical display or statistical tests that may be used

Question 6

what is correlation

Answer 6

an association; does not imply causation

Question 7

when does causation exist

Answer 7

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

Question 8

when does a positive correlation exist

Answer 8

when an increase in one variable is accompanied by an increase in the other variable

Question 9

when does a negative correlation exist

Answer 9

when an increase in one variable is accompanied by a decrease in the other variable

Question 10

what is strength of correlation proportional to

Answer 10

spread of values from line of best fit