Panic

Question 1

Measures of central location

Answer 1

mean median and mode

Question 2

Measures varibility

Answer 2

Range and standard deviation

Question 3

Measures of position

Answer 3

percentiles, ranks, and Z-scores

Question 4

standard deviation (sample)

Answer 4

sqrt(sum of (x-xbar)^2/(n-1))

or

sqrt(sum of (x^2)-(1/n) (sum of (x))^2 all dividied by (n-1))

Question 5

standard deviation (population)

Answer 5

sum of (x-xbar)^2/(n)

Question 6

calculate position of percentile

Answer 6

position = (percentile/100) times population size

Question 7

find percintile rank

Answer 7

num of vaules below or equal to 6 divided by total number of vaules

Question 8

five number summary

Answer 8

min q1 q2 q3 max

Question 9

IQR

Answer 9

q3 - q1

Question 10

z scores

Answer 10

x-avergare/deviation

Question 11

z scores to vaule

Answer 11

average + zscore times standard deviation

Question 12

empirical rule

Answer 12

1 SD = 34 + 34
2 SD = 1SD + 13.5 + 13.5
3 SD = 2SD + 2.35 + 2.35
4 SD = 3SD + 0.15 + 0.15

Question 13

chebsehv

Answer 13

1 SD = unkown
2 SD = 3/4
3 SD = 7/8
4 SD = 1- 1/(standard deviation^2)

Question 14

sample space

Answer 14

set of all possible outcomes

Question 15

an event

Answer 15

a subset of sample space

Question 16

rules of probability

Answer 16

always between 0 and 1
sum of all probabilities = 1

Question 17

complements

Answer 17

1- probability of event = evetn compliment

Question 18

Intersect of events A and B

Answer 18

prob(A) times prob(B)

Question 19

Union of events A nd B

Answer 19

Prob (A) + Prob (B) - Intersect of events A and B

Question 20

Mutual exclusive events

Answer 20

Intersect of events A and B = 0

Question 21

Conditional events P (A|B)

Answer 21

Intersect of events A and B / P(B)

Question 22

Independant events

Answer 22

Intersect of events A and B = P(A) time P (B)

Question 23

Sampling with replacement

Answer 23

The randomly selected unit is returned to the population after being selected. When
sampling with replacement, it is possible for the same unit to be sampled more than
once.

Question 24

Sampling without replacement

Answer 24

the randomly selected unit is not returned to the population after being selected.
When sampling without replacement, it is not possible for the same unit to be
sampled more than once

Question 25

Mean of discrete probability distributions

Answer 25

sum of (x times p(x))

Question 26

SD of discrete probability distributions

Answer 26

(discrete probability distributions are always with populations)
sqrt ( sumof (x-average)^2 * P(x))

Question 27

binomial distribution

Answer 27

(n/x)p^x*q^(n-x)

Question 28

n/x

Answer 28

n!/(x!(n-x)!)

Question 29

what is x

Answer 29

ammount of succes

Question 30

what is n

Answer 30

ammount of trials

Question 31

what is p

Answer 31

succes rate

Question 32

what is q

Answer 32

failure rate

Question 33

binomial distribution average

Answer 33

P time Q

Question 34

binomial distribution SD

Answer 34

N time P times Q