Lesson 13: Presentation of Quantitative Data

Question 1

Scatter graph

Answer 1

A graphical display that shows the correlation or relationship between two sets of data (or co-variables) by plotting dots to represent each pair of scores. A scatter graph indicates the strength and direction if the correlation between two variables.

Question 2

Bar chart

Answer 2

Used to show frequency data for discrete variables.

Question 3

Normal distribution

Answer 3

Symmetrical distribution, most people are located in the middle area of the curve and very few people are at the extreme ends. The mean, mode and median all occupy the same mid-point of the curve.

Question 4

Positive skew

Answer 4

Most of the data is concentrated to the left of the graph. Therefore, the mode remains as the highest point of the peak, the median comes next but the mean has been dragged across the right. The opposite occurs in a negative skew.