Measures of central tendancy

Question 1

the “Mu” symbol =

Answer 1

population mean

Question 2

The “X-bar” symbol =

Answer 2

Sample mean

Question 3

Population mean (Mu) equals

Answer 3

The sum of the value of each score “x” (numerator) divided by the number of scores (denominator) aka: sigma X-sub-i DIVIDED by N note capital (N) for population

Question 4

Sample mean (x-bar) equals

Answer 4

x-bar equals sigma x-sub-i DIVIDED by n note small (n) for sample

Question 5

median =

Answer 5

Middle 50% is more than and 50% is less than (true middle, order the scores and find the middle)

Question 6

Measures of Central Tendency are

Answer 6

Median Mode Mean

Question 7

mode=

Answer 7

most common or frequent value

Question 8

What shape is create when the median mode and mean are all the same

Answer 8

Bell Curve

Question 9

Skew is described as

Answer 9

the outliers, what is being pulled away from the majority (smaller longer end of the curve)

Question 10

a long tail to the left is

Answer 10

negatively skewed

Question 11

a long tail to the right is

Answer 11

positively skewed

Question 12

The —— is heavily influenced by skew

Answer 12

mean

Question 13

The —— is moderately influenced by skew

Answer 13

median

Question 14

The —– is almost immune to skew

Answer 14

mode

Question 15

The highest point of a frequency distribution will indicate the

Answer 15

mode

Question 16

is the mean or the median more influenced by skew

Answer 16

the mean, the median is the middle score so will always be in the middle, but the median is the average and will be heavily influenced by the skew

Question 17

The —— is especially susceptible to extreme values in a dataset

Answer 17

mean

Question 18

Mu =

Answer 18

population mean

Question 19

X bar =

Answer 19

Sample mean

Question 20

when indicating the number of subjects in a population the symbol used is

Answer 20

N (upper case)

Question 21

when indicating the number of subjects in a sample the symbol used is

Answer 21

n (lower case)