Scientific working - Histograms and skewed distribution

What is a histogram?

A bar graph depicting a frequency distribution

What are the rules for histograms?

- Frequency on y axis

- Bars must touch

What is a skewed distribuion?

Where scores that are extreme can really affect the mean causing it be a lot higher or lower

How do we avoid skewed distribution?

Using the median rather than the mean

What type of skewed distribution is there?

Positive and negative

What can result in a skewed distribution?

Collecting data from an unrepresentative population

Describe a negative skew.

Most of the data values are at the upper end

(Y axis going up to heaven and skew is away from y axis because it was too negative/bad)

Describe a positive skew.

Most of the data values are at the lower end

(Y axis going up to heaven and skew is towards y axis because it is positive and good)

Histogram with a negative skew.

Histogram with a positive skew.