Descriptive Statistics

1.Name 2 broad types of descriptive statistics.

• Mann Whitney U

• Sign test

• Measures of central tendency

• Measures of dispersion

Name 3 measures of central tendency

• Range

• Mode

• Median

• Standard deviation

• Mean

Name 2 measures of dispersion

• Range

• Mode

• Median

• Standard deviation

• Mean

Advantage of using the mean?

• Gives more accurate result as takes all data into consideration

• It is not distorted by outliers

• Easy and quick to calculate

Advantage of using the median?

• Gives more accurate result as takes all data into consideration

• It is not distorted by outliers

• Easy and quick to calculate

Advantage of using the mode?

• Gives more accurate result as takes all data into consideration

• It is not distorted by outliers

• Easy and quick to calculate

Disadvantage of using the mean?

• Relies on there being 2 or more scores that are the same

• Less sensitive than the mean as it doesn't use all of the scores

• Outliers can distort the result

Disadvantage of using the median as a a measure of central tendency

• Relies on there being 2 or more scores that are the same

• Less sensitive than the mean as it doesn't use all of the scores

• Outliers can distort the result

Disadvantage of using the mode?

• Confusing when there are 2 opposing mode scores

• Less sensitive than the mean as it doesn't use all of the scores

• Outliers can distort the result

Main advantage of standard deviation over using the range

• More accurate as it looks at how much each score deviates from the mean

• It is quicker and easier to do than the range