PPT-Central Tendency

Question 1

Central tendency

Answer 1

numerical values that refer to the center of the distribution
-mode, median, mean

Question 2

Mode

Answer 2

most commonly occurring score in a set of data
-nominal, ordinal, interval, ratio
-average if two modes are adjacent
-bimodal if separated

Question 3

Mode advantages

Answer 3

-only one for nominal data
-not affected by extreme scores

Question 4

Mode disadvantages

Answer 4

not representative of the entire set of data

Question 5

Outliers

Answer 5

scores that lie far out from the distribution

Question 6

Median

Answer 6

exact middle of data
-ordinal, interval, ratio

Question 7

Median location

Answer 7

=(n+1)/2

Question 8

Median advantages

Answer 8

-not affected by extreme scores
-not affected by undetermined scores
-appropriate measure of central tendency for ordinal

Question 9

Median disadvantage

Answer 9

-ignores outliers
-not nominal
-limitations in statistical app

Question 10

Mean

Answer 10

average score, most commonly used
-interval and ratio

Question 11

Sample mean equation

Answer 11

ƩX/n

Question 12

Population mean equation

Answer 12

ƩX/N

Question 13

Mean advantages

Answer 13

-sensitive to all data
-commonly understood
-easily used
-good estimate

Question 14

Mean disadvantage

Answer 14

-influenced by outliers

Question 15

Normal distribution

Answer 15

-symmetrical, unimodal
-mean = median = mode

Question 16

Skewed distributions

Answer 16

mode - tallest point
median - the middle
mean - toward tail
positive - right
negative - left

Question 17

Mode representation

Answer 17

nominal

Question 18

Median representation

Answer 18

-ordinal
-interval/ratio - skewed

Question 19

Mean representation

Answer 19

-interval/ratio - symmetrical