METHODS - graphs

Question 1

bar chart

Answer 1

categories usually placed along x axis and frequency on y axis
discrete data

Question 2

histogram

Answer 2

bars touch each other

continuous data

Question 3

line graph

Answer 3

continuous data

line often shows how something changes

Question 4

scattergram

Answer 4

used for correlational analysis

continuous data

Question 5

normal distribution

Answer 5

symmetrical, bell-shaped curve
most people in middle area of curve and very few at extreme ends
mean, median and mode all occupy the same mid-point of the curve

Question 6

skewed distribution

Answer 6

distributions that lean to one side because most people are either at the lower or upper end of the distribution

Question 7

negative skew

Answer 7

most of the distribution is concentrated towards the right of a graph
e.g a very easy test in which most people get high marks would produce a negative skew
mode is the highest point of the peak, the median comes next to the left, and the mean is furthest to the left (if scores are arranged from lowest to highest)

Question 8

positive skew

Answer 8

most of the distribution is concentrated to the left of the graph
e.g difficult test
mode is the highest point, then median on the right and mean furthest right