Lesson 14 - Presentation of Quantitative Data

Question 1

Tables

Answer 1

Not raw scores
Data has been converted to descriptive statistics
(Measures of central tendency or measures of dispersion)
Should have a paragraph under the table explaining the data

Question 2

Scattergrams

Answer 2

Graphical display to show correlation or relationship between two sets of data (co-variables)
Plots dots to represent each pair of scores
Scattergraph indicates strength and direction of correlation between co-variables

Question 3

Bar Chart

Answer 3

Frequency data for discrete variables

Height of each bar represents frequency of each item

Question 4

Distributions

Normal

Answer 4

Curve ball shape
Most people located within middle area of curve
Very few at extreme ends
Mean, mode and median occupy same mid-point of the curve
Ends of the curve never touch x axis as more extreme scores are always theoretically possible

Question 5

Distributions

Skewed

Answer 5

Distributions leans to one side
Positive skew => most data is concentrated to left of the graph, mode remains at highest point, median comes next but mean has been dragged across to the right
Opposite occurs in a negative skew