presentation of quantitative data

Question 1

what is a bar chart

Answer 1

• frequency of each variable is represented by the height of the bars
• discrete data

Question 2

what are histograms

Answer 2

• bars touch = continuous
• shows frequency over time

Question 3

what is a scattergram

Answer 3

• represent the strength and direction of a relationship between 2 co-variables

Question 4

what is a normal distribution

Answer 4

• symmetrical spread of frequency data forming a bell shaped pattern
• mean, median, mode all in central

Question 5

what is a skewed distribution

Answer 5

Negative skew - long tail on left side of the peak
Positive skew - long tail on right side of the peak