AP Statistics Chapter 12 Review

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What does a low chi-square indicate?

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22 Terms

1

What does a low chi-square indicate?

The sample meets expectations.

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2

What does a high chi-square indicate?

The sample does not meet expectations.

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3

How do you find the p-value GIVEN the chi-square value?

You plug in the chi-square value as the lower boundary and, depending on your hypothesis, double it.

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4

How do you know when to test for homogeneity?

When there are at least two samples and one variable is recorded.

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5

How do you know when to test for independence?

When there is one sample with two/multiple variables being recorded.

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6

What does chi-square measure?

How much the observed counts deviate from the expected counts.

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7

What happens if you have a large chi-square value? Is this evidence against the HO?

Yes

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8

How do you calculate the degrees of freedom for two-way tables?

You do number of columns-1 times the number of rows-1

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9

How do you write a null hypothesis for Chi-Square test for Homogeneity?

There is no difference in the distribution of _____ for several populations/treatments

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10

How do you write a null hypothesis for a Chi-Square test for Independence?

Ho: There is no association between (categorical 1) and (categorical variable 2)

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11

What does independent mean?

no association

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12

How do you find expected counts for two way tables?

(Row Total * Column Total)/Table Total

DO THIS FOR THE SMALLEST VALUES

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13

How do you know when to use chi-square versus T-test/z-tests?

Because chi-square is for categorical variables while T and Z are for quantitative.

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14

What do you have to say in the Plan step?

You need to say your test type “EX: chi-square goodness of fit, chi-square test for independence”

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15

What is the general equation for a population regression line?

UY = a+Bx

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16

How do you calculate the degrees of freedom for t-interval for slope?

df=n-2

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17

When you’re doing a t-test for slope, what is your Null hypothesis?

Ho: B = Bo

True slope = Claimed Slope

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18

How do you find the p-value given the test statistic in a t-test for slope?

tCDF where df is n-2

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19

What is the USUALLY the alternate hypothesis in t-test for slope?

HA: B≠0

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20

What is the calculator test for t-test for slope called?

Linear Regression t-test.

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21

How do you calculate the degrees of freedom for a chi-square goodness of fit test?

df = n-1

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22

What is the null/alternative hypothesis for a chi-square goodness of fit test?

HO: The stated distribution of _______ is correct
HA: The stated distribution is not correct

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