Chapter 3

Question 1

Mean

Answer 1

average

Question 2

Median

Answer 2

Middle number

Question 3

Mode

Answer 3

Most common number

Question 4

Range of motion

Answer 4

Distance between highest and lowest point

Question 5

What is sample variance

Answer 5

average of squared distance between each data

Question 6

How do you calculate sample variance

Answer 6

Numerator: (point1 of data-av)^2+(point2 of data-av)^2+…

denominator: Sample size-1

Question 7

How to calculate standard deviation

Answer 7

do sample variance but sqrt the result

Question 8

what does a lower standard deviation mean

Answer 8

more consistency

Question 9

Give an example of a causal relationship

Answer 9

Amount of snow and car accidents

Question 10

what central tendency to use when the word ‘typical is used’

Answer 10

mean

Question 11

what central tendency to use when the word ‘most common’ is used

Answer 11

mode

Question 12

what central tendency to use when the word ‘consistency’ is used

Answer 12

standard deviation

Question 13

what central tendency to use when the word ‘spread’ is used

Answer 13

Standard deviation

Question 14

formula for coeffcient

Answer 14

(sample standard deviation)/(sample mean) * 100

Question 15

formula for precentile

Answer 15

i=p/100 (n)

Question 16

Interquartile range

Answer 16

describes middle 50% of range

Question 17

sample covariance formula

Question 18

Box and whisker plot

Answer 18

shows relative position of 3 quarters

Question 19

correlation coefficient

Answer 19

the direction of relation between 2 variables seen using a scatter plot
(less obvious direction closer to 0 correlation)

Question 20

sample correlation coefficient (r) formula

Answer 20

(the sample covariance)/(the sample stand dev x)*(the sample stand dev y)