Inferential Stat

Question 1

Find the Value of K

Answer 1

Must add up to 1
Add all and set equal to 1

Question 2

find E(x) with a table

Answer 2

Rewrite the table with k
Multiply the top and bottom
Add all up

Question 3

When finding P(X=x) you must…

Answer 3

Include ALL possibilities

Question 4

How to solve binomial dist. problems with an exact number + at most

Answer 4

use binomial pdf
find
number of trials
p=probability
x= amount trying to find
solve

Question 5

Find the expected number of something

Answer 5

Multiply probability by the total amount

Question 6

How to solve binomial dist. problems with at least a number + less than

Answer 6

Use binomial CDF
number of trials ( the same for any question)
probability (the same)
x= 1 fewer than the given number
calculate and subtract from 1

Question 7

Binomial dist. more than

Answer 7

Use Binom CDF
Subtract 1 - normal calculations

Question 8

Binomial dist. less than

Answer 8

Binom cdf
Normal calc just x-1

Question 9

how do you find the variance of a binomial dist. ?

Answer 9

total * prob. * (1-prob)

Question 10

When given Z ~ N(0,1) what do you plug in

Answer 10

Plug into NormCDF
Use upper/lower limit
doesn’t matter if its less than or equal to

Question 11

When given Z ~ N(#, #) not (0, 1)

Answer 11

Plug into NormCDF
Square root the second number
Plug 1st into mean
Plug 2nd into SD

Question 12

Find P given mean and area

Answer 12

Graph problem
Find probability of mean (.50)
Subtract .5- entire thing ,

Question 13

Variance

Answer 13

standard deviation squared

Question 14

how to find the value of a variable with standard deviation and mean

Answer 14

Use invNorm
plug in equal
plug in mean + SD

Question 15

z score

Answer 15

Z= X(raw data)-mean/standard deviation

Question 16

When do you use a z-score

Answer 16

Normal distribution
Standard deviation
Finding probability with a Z~ N(#,#)

Question 17

Given Z ~ N(0,1), use graphing calc

Answer 17

P(#<Z<a) =#
Draw on paper g
Plug into NormCDF to find Z<1
Find P(Z<a)-P(Z<1) = #
Add P(Z<1) to number to find a
Plug A into InvNorm

Question 18

Null hypothesis (H0)

Answer 18

The hypothesis did not work

Question 19

Alternative hypothesis (H1)

Answer 19

the hypothesis did work

Question 20

If the probability is less than or equal to the predicted amount…

Answer 20

Reject the H0

Question 21

If the probability is greater than the predicted amount…

Answer 21

Fail to reject the H0

Question 22

Z test

Answer 22

Exact amount of numbers for something

Question 23

2 samp z test

Answer 23

quantifiable amount of numbers for something
ex. hours

Question 24

1-prop z test

Answer 24

qualitative comparison

Question 25

2- prop z test

Answer 25

percentages

Question 26

How do you find p?

Answer 26

plug known numbers into what test it is

Question 27

what do you write after you either reject or FTR the hypothesis

Answer 27

either restate the claim if its Reject or debate the claim if its FTR