Displaying and interpreting graphs

Question 1

What does a summary table show

Answer 1

Clear summary of data using descriptive stats
Descriptive stats = Summarised quantitative data

Should include:
A measure of central tendency e.g. mean mode median
A measure of dispersion e.g. range, standard deviation

Question 2

What does standard deviation show

Answer 2

How far numbers are from the mean

Question 3

What does range show

Answer 3

How spread out values are

Question 4

What is a bar chart used for

Answer 4

Used to represent discrete(separate), categorical data
Frequency on y axis
Categories on x axis

Question 5

What is a histogram used for

Answer 5

Used for continuous data (e.g. percentage scores on a test)

Frequency on y axis/intervals on x axis

Question 6

What is a line graph used for

Answer 6

Also used for continuous data
Shows how data changes over time
IV on x axis/DV on y axis

Question 7

What is a scattergram used for

Answer 7

Measures relationship between 2 variables