MET 05 - Graphs and distributions

Question 1

What is a scattergram?

Answer 1

• A type of graph that represents the strength and direction of the relationship between co-variables in a correlation analysis
• They do not depict differences but associations between co-variables

Question 2

What is a bar chart?

Answer 2

• A type of graph in which the frequency of each variable is represented by the height of the bars
• They are used when data is divided into categories, otherwise known as discrete data

Question 3

What is a histogram?

Answer 3

• A type of graph which shows frequency but, unlike a bar chart, the area of the bars (not just the height) represents frequency
• The x-axis must start at a true zero and the scale is continuous.

Question 4

What is a normal distribution?

Answer 4

• A symmetrical spread of frequency data that forms a bell-shaped pattern
• The mean, median and mode are all located at the highest peak

Question 5

What is a skewed distribution?

Answer 5

A spread of frequency data that is not symmetrical, where the data clusters to one end

Question 6

What is a positive skew?

Answer 6

• A type of frequency distribution in which the long tail is on the positive (right) side of the peak and most of the distribution is concentrated on the left
• In a positive skew the mean>median>mode

Question 7

What is a negative skew?

Answer 7

• A type of frequency distribution in which the long tail is on the negative (left) side of the peak and most of the distribution is concentrated on the right
• In a negative skew the mode>median>mean