Data analysis: graphs

Question 1

Bar charts

Answer 1

• a type of graph

- where the frequency of each variable is represented by the height of the bars

Question 2

Scattergram

Answer 2

• a type of graph
• that represents the strength and direction of a relationship between co-variables
• in a correlation analysis

Question 3

Types of distribution

List

Answer 3

Normal distribution
Skewed distribution
└Positive skew
└Negative skew

Question 4

Normal distribution

Answer 4

• a spread of frequency data that is symmetrical
• forms a bell shaped pattern
• mean, median and mode all located on the highest peak

Question 5

Skewed distribution

Answer 5

• a spread of frequency data that is not symmetrical

- data clusters at one end

Question 6

Positive skew

Answer 6

• long side of the tail is on the positive (right) side of the peak
• most the distribution is concentrated on the left
• mode, median, mean

Question 7

Negative skew

Answer 7

• long side of the tail is on the negative (left) side of the peak
• most the distribution is concentrated on the right
• mean, median, mode