Applied Statistics - 2.1 - Measures of Central Tendency

Question 1

Qualitative / Quantitative, Definition, In what case is it useless

Mode / Modal Class

Answer 1

• Both qualitative and quanitative
• The value or class that occurs most often
• Not informative if each value occurs once

Question 2

Qualitative / Quantitative, Definition, When is it usually used

Median (2nd quartile)

Answer 2

• Quantitative
• The middle value when the data values are put in order
• It is used when there are exteme values

Question 3

Qualitative / Quantitative, Definition, In what case is it bad to use

Mean (x̄)

Answer 3

• Quantitative data
• Average of values
• When there are extreme values

Question 4

Equation, what do the letters mean

Mean (frequency table)

Answer 4

• x̄ = Σ(x * f )/ Σf
• x = midpoint of each class interval
• f = frequency