Stats terminology and tests 2

Question 1

What is the standard error?

Answer 1

The amount of lack of confidence in the estimate of our mean

Question 2

Low standard error means what level of confidence in the mean?

Answer 2

High

Question 3

High standard error means what level of confidence in the mean?

Answer 3

Low

Question 4

Standard error formula?

Answer 4

Standard deviation/(sqrt(n))

Question 5

Out of two populations with the same mean and sd but different population sizes, which one would have a larger standard error?

Answer 5

The one with a larger population

Question 6

What is a z score?

Answer 6

The amount of standard deviations away from the mean that one data point is

Question 7

Mean = 100, sd is 5, what is the z score of 120?

Answer 7

+4

Question 8

Mean = 100, sd is 5, what is the z score of 85?

Answer 8

-3

Question 9

Characteristics of a Bernouli trial?

Answer 9

Success/failure, probability of success is the same in every trial, trials are independent

Question 10

What is a chi squared test used for?

Answer 10

To see if the observed results fit with expected results

Question 11

What is a chi squared test suitable for?

Answer 11

frequency data

Question 12

What do you do with a chi squared value?

Answer 12

Look it up in a chi squared table using the degrees of freedom

Question 13

Degrees of freedom?

Answer 13

N-1

Question 14

How do you get the p value from a chi squared test?

Answer 14

looking it up in a chi squared table

Question 15

When is yates correction used?

Answer 15

When doing chi squared with two values

Question 16

What is yates correction?

Answer 16

Subtract 0.5 from each value of O-E ignoring the sign (|O-E|-0.5)

Question 17

Limits to chi squared test?

Answer 17

No expected category should be less than 1 observation
No more than 1/5 of the expected values should be less than 5

Question 18

What can be used as a test of association?

Answer 18

chi squared test

Question 19

What must done before using a chi squared test as a test of association?

Answer 19

Contingency table

Question 20

How to find the expected value of a cell in a contingency table?

Answer 20

(rowtotal*columntotal)/overalltotal

Question 21

Degrees of freedom when using a contingency table?

Answer 21

(rows-1)*(columns-1)

Question 22

What are the two tests used for categorical data (frequency data)?

Answer 22

Chi squared or binomial

Question 23

What test is used when there is more than two categories of categorical (frequency) data?

Answer 23

Chi squared

Question 24

What tests are used when there is two categories of categorical (frequency) data?

Answer 24

binomial or chi squared

Question 25

What does a regression analysis do?

Answer 25

Fits a straight line against a scatterplot

Question 26

X axis on a regression analysis?

Answer 26

Independent or predictor variable (variable that causes the response) (thing you have control over)

Question 27

Y axis on regression analysis?

Answer 27

Dependent or response variable