Hypothesis Tests Flashcards

1
Q

What is the null hypothesis of a chi-square test?

A

H0: One variable is independent of the other variable

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2
Q

What are the steps to running a chi-square test of independence on your GDC?

A
  1. Create and name a matrix
  2. Run a X2 2-way Test.
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3
Q

How can you tell how many degrees of freedom your test will have?

A

You look at the number of rows and columns in the matrix (not including the totals).

degrees of freedom = (rows -1) * (columns -1)

OR

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4
Q

How do you find the expected frequency?

A

Multiply the two probabilities and the total number of students.

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5
Q

What is the critical value for a X2 test of independence?

A

It’s the cut-off point. It tells you where you make the decision to reject or not reject the null hypothesis.

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6
Q

How do you find the critical value on your GDC?

A
  1. Use the “inverse X2” feature of the GDC.
    area = 1 - significance level.
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7
Q

How do you use the critical value to make a decision about your test (reject/not reject)?

A

Reject if statistic > critical value

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8
Q

How do you use the p-value to make a decision about your test (reject/not reject)?

A

Reject if p < significance level

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9
Q
A
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