Chapter 3

Question 1

What does Central Tendency mean?

Answer 1

A score representing average of data

• Centre of data set
• A single number indicating where many scores lie

Question 2

What three measures fall under central tendency?

Answer 2

1. Mean
2. Median
3. Mode

Question 3

What is mean?

Answer 3

Average; calculated by adding up all the scores and dividing by the number of scores in total

Note: Highly susceptible to extreme values

Question 4

The mean of a population is symobolized by what?

Answer 4

The greek letter “mu”; it is a parameter

Remember: A parameter represents the average of an entire population

Question 5

What is median? How would you calculate the location of median?

Answer 5

Midpoint in the given observations; L= n+1/2

Example: 11,12,13,14,15 ==> 5+1/2 = 3 ==> 3 is 13 therefore 13 is the median

Question 6

What is Mode? Give an example

Answer 6

Mode is the value that occurs most often; only good for categorical data or large interval/ratio data

• Example: 1,7,5,9,8,7 ==> 7 is the most frequent number ==> Mode = 7