# Ap stats: chapter 9 Flashcards

in order to decrease Type II

Increase Type I

Use equal to and not equal to when

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

Interpret power

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

significance level and confidence level MUST

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

To increase power

increase n OR increase significance level OR increase type II

how to calculate outliers

IQR: Q3-Q1

low: Q1 - 1.5(IQR)

high: Q3 + 1.5(IQR)

when you fail to reject Ho its a type

II error

when you reject Ho its a type

I error

if the power is 80% then type II is ?

20% (them two equal 100)

To DECREASE type 11

INCREASE (choose the highest) significance level

when giving significance level and confidence level ALWAYS make sure to

compare / MATCH them (talk about them!)

test –> 5

one sample z-test for proportions

test statistic for proportions

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

test –> 2

One sample t-test for Mu

AND

matched pair t-test for Mu

test statistic for Mu

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