Ap stats: chapter 9

Question 1

in order to decrease Type II

Answer 1

Increase Type I

Question 2

Use equal to and not equal to when

Answer 2

figuring out is something is fair/unfair (or when finding difference)

Question 3

Interpret power

Answer 3

If the true ___ is really ___, then we have a __% chance of detecting a __.

Question 4

significance level and confidence level MUST

Answer 4

MATCH (=100) in order to use them in the same situation

Question 5

To increase power

Answer 5

increase n OR increase significance level OR increase type II

Question 6

how to calculate outliers

Answer 6

IQR: Q3-Q1
low: Q1 - 1.5(IQR)
high: Q3 + 1.5(IQR)

Question 7

when you fail to reject Ho its a type

Answer 7

II error

Question 8

when you reject Ho its a type

Answer 8

I error

Question 9

if the power is 80% then type II is ?

Answer 9

20% (them two equal 100)

Question 10

To DECREASE type 11

Answer 10

INCREASE (choose the highest) significance level

Question 11

when giving significance level and confidence level ALWAYS make sure to

Answer 11

compare / MATCH them (talk about them!)

Question 12

test –> 5

Answer 12

one sample z-test for proportions

Question 13

test statistic for proportions

Answer 13

z = p-hat - p / sqr-root p(q)/n

Question 14

test –> 2

Answer 14

One sample t-test for Mu
AND
matched pair t-test for Mu

Question 15

test statistic for Mu

Answer 15

t = mean - Mu / Sx / sqr-root n

Question 16

if p-value is less than significance level

Answer 16

• reject Ho
• stat sig
  DO

Question 17

if p-value is more than significance level

Answer 17

• fail to reject Ho
• not stat sig
  DO NOT

Question 18

MATCHED PAIRS

Answer 18

• ## POI is the true average DIFFERENCE between ___.Ho: Mu = 0
  Ha: Mu <,>,(not equal to) 0
  —–
  MATCHED PAIR t-test for Mu:

Question 19

CLT check

Answer 19

n greater than or equal to 30

Question 20

Null Hypothesis(Ho)

Answer 20

NO CHANGE

Question 21

Alternative Hypothesis (Ha)

Answer 21

IS CHANGE

Question 22

Interpret p-value

Answer 22

We do not have convincing evidence that the ____is less than/more than/different than ___.

Question 23

PANIC conclusion

Answer 23

we are __% confident that the interval ___ to ___ capture the true proportion/average of ___.

Question 24

interpret confidence level

Answer 24

if we make many __% confidence intervals, we expect about __% to capture the true mean/proportion.

Question 25

Type I error occurs when

Answer 25

We say Ha, but it’s Ho

Question 26

Type II error occurs when

Answer 26

We say Ho, but it’s Ha

Question 27

Null is…

Answer 27

ASK ABOUT NULL