Presentation Of Quantitative Data

Question 1

Bar charts

Answer 1

Type of graph where the frequency of each variable is represented by the height of bars

• used when data is divided into categories e.g. discrete data

Question 2

Histograms

Answer 2

Type of graph that shows frequency but the area of the bars represents a frequency

• x axis starts at true zero and the scale is continuous
• continuous data shown, one category shown

Question 3

Scattergram

Answer 3

A type of graph that represents the strength and direction of the relationship between variables in correlational analysis

Question 4

Normal distribution

Answer 4

Symmetrical spread of frequency of data that forms a bell shaped curve; the mean, median, mode all located at the highest peak

• most people are located in the middle, with few people at the extreme ends

Question 5

Skewed distributions

Answer 5

Skewed = spread of frequency data that is not symmetrical and the data clusters towards one end

Positive skew = the long tail is is on the positive right side of the peak, most of the distribution is on the left
- extremes in data, pull the mean to the right

Negative skew = the long tail is on the negative left side of the peak, most of the distribution is on the right
- the mean is pulled to the left