Chapter 10

Question 1

Weighted mean

Answer 1

Like weighted grades

Question 2

Geometric mean

Answer 2

used to find the average of a set showing growth or decay, values are multiplied together instead of added

Question 3

Harmonic means

Answer 3

Used for rates of change,
n/ {(1/x1)+(1/x2)…..+(1/xn)}

Question 4

nominal measurement

Answer 4

Gathers information and labels variables without performing any mathematical operations, useful for mode

Question 5

ordinal measurement

Answer 5

places values in a certain order, useful for mean.

Question 6

interval measurement

Answer 6

allows you to find intervals between scores on a test. puts values in order and determines differences between the variables. good for mean median and mode

Question 7

Random variable

Answer 7

a variable that describes all possible outcomes of a random process

Question 8

discrete

Answer 8

total number of outcomes is countable

Question 9

continuous

Answer 9

total number of outcomes is not countable

Question 10

expected value

Answer 10

the outcome we expect on average

formula: sum of variable x probability (for discrete)

Limit(xF(x)dx (for continuous)

Question 11

quartile

Answer 11

a group of values and or means that divide a set into quarters or four groups

Question 12

Interquartile range

Answer 12

a value that is the difference between the upper quartile value and the lower quartile value

Question 13

Formula for expected value for discrete probability distribution.

Answer 13

E(x) = NsumK=0 (XsubK * P(Xsubk)