DISPLAYING DATA (GRAPHS) AND DISTRIBUTIONS

Question 1

Bar charts

Answer 1

• Used to represent data which is divided into categories (discrete data)
• e.g. yes or no

Question 2

Line graphs

Answer 2

• Used to represent data in numerical form (continuous data)
• e.g. the age of a person

Question 3

Histograms

Answer 3

• Represent continuous data.
• Bars represent each score rather than a point.
• Bars are drawn touching to show that data is continuous
  They are useful when there is a large range of data.
• Each group of scores is known as a class interval

Question 4

Scattergrams

Answer 4

• Used to represent relationships between variables.
• Both variables need to be measured using a numerical scale.
• One variable is represented on x axis, and the other on y axis

Question 5

Normal Distribution

Answer 5

• The idea of normal distribution is that, for a given attribute, like scores on a test, most of said scores will be the mean or around the mean.
• Decresing scores will be further away from the mean. Normally distributed data is symmetrical; when it is plotted on graph, it makes an even bell shapeed curve.
• The same amount of scores above the mean will be below it as well with normal distribution.

Question 6

Skewed Distribution

Answer 6

• Skewed distribution is when there is an uneven amount of scores above or below the mean value.
• A positive skewed distribution is when there is an extreme high score.
• negative is when there is an extreme low score

Question 7

positive skewed distribution

Answer 7

will have more low than high scores because the skew has been caused by an outlying high score

Question 8

A negative skewed distribution

Answer 8

will have more high scores than it will low scores because the skew has been caused by an outlying low score.