Stat Test 7

Front 1

μ

Back 1

Population Mean

Front 2

Describing sampling distribution

Back 2

Center, Spread, Shape, Unusual features

Front 3

Two Assumptions

Back 3

Is it simple random sampling?
Is the population normal? or is the sample size large enough to meet the clt?

Front 4

Standard Distribution Summary answer

Back 4

X1-X2 ~ N (Center, Spread)

Front 5

When asking for probability

Back 5

Use Z-Score Transformation

Front 6

Answer to unusual features...

Back 6

none or explain

Front 7

If simple random sample is not said...

Back 7

the assumptions are not met

Front 8

Inference

Back 8

statement about population based on data collected in sample

Front 9

Population notations use....

Back 9

Greek letters are used for...

Front 10

Sample notations use..

Back 10

Alphabet letters are used for...

Front 11

μ

Back 11

population mean

Front 12

σ

Back 12

population standard deviation

Front 13

π

Back 13

proportion of population

Front 14

x̅

Back 14

sample mean

Front 15

S

Back 15

standard deviation of sample

Front 16

p̂

Back 16

proportion of sample

Front 17

When you know the population standard deviation and population mean for a population

Back 17

Use Z score when...

Front 18

When the population standard deviation and population mean are unknown

Back 18

use T score when...

Front 19

outlier

Back 19

When a point is over or under the Y axis

Front 20

influential observation

Back 20

When a point is left or right of X axis

Front 21

lurking variable

Back 21

variable that is not accounted for

Front 22

lowercase n stands for

Back 22

# in a sample

Front 23

uppercase N stands for

Back 23

# in a population

Front 24

skewed

Back 24

one side of distribution is longer than other in a graph

Front 25

bimodal

Back 25

two significant peaks in graph

Front 26

trimodal

Back 26

three significant peaks in graph

Front 27

middle quartile

Back 27

mean in a quartile

Front 28

lower quartile Q1

Back 28

smaller than 75% of graph

Front 29

upper quartile Q3

Back 29

larger than 75% of graph

Front 30

How to get interquartile range

Back 30

Stat -> calc -> 1 -> enter -> scroll down

Front 31

The standard deviation of standard normal distribution is always

Back 31

This always equals one

Front 32

When describing a distribution

Back 32

1. Center (ex. X1 to X2, median )
2. Spread (ex. range, quartiles, or SD)
3. Shape (normal, bimodal, skewed)
4. Unusual Features (outliers)

Front 33

Describing relationship between variables

Back 33

1. Positive or weak correlation (direction)
2. Linear or non-linear (form)
3. Strength (weak= lots of scatter_

Front 34

Y=mx+b stands for

Back 34

Y= intercept + slope(X)

Front 35

The intercept is...

Back 35

the predicted value of Y when x=0

Front 36

The slope is..

Back 36

the amount that Y changes when X is increased by 1

Front 37

When X haas a normal distribution with mean and standard deviation

Back 37

X ~N ( μ, σ )

Front 38

A standard normal distribution is denoted by __
The mean is denoted by __ & equals __
The standard deviation ___ & equals ___

Back 38

Z~N (0, 1)

Front 39

The probability that Z is equal to a value is...

Back 39

The probability that __ is equal to a value is 0

Front 40

When looking for a probability in a greater than problem

Back 40

Look up the less than probability in table and subtract from 1

Front 41

Null hypothesis

Back 41

Ho: μ = #

Front 42

Alternative Hypothesis

Back 42

Ha: μ is > or < than 3

Front 43

Formula for point estimate

Back 43

X1-X2 or μ1- μ2
The difference between population means

Front 44

The five number summary includes

Back 44

Minimum, Q1, Median, Q3, Maximum are part of the...

Front 45

Notation for level of significance

Back 45

α (fish)