Chapter 15 Flashcards

1
Q

How to determine degress of freedom in chi square test

A

k-1

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2
Q

What is the symbol for the chi square test statistic

A

X^2

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3
Q

What does fo represent

A

Observed frequency in a specific category

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4
Q

What does fe represent

A

expect frequency in specific category

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5
Q

What is the formula for chi square test

A

Sum((f0-fe)^2/fe

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6
Q

What are the three characteristics of a chi square distribution

A
  1. Always greater than or equal to zero
  2. It is a family of distributions based on the degrees of freedom
  3. They are positively squared.
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7
Q

What are two limitations to the chi square test

A
  1. If there are two categories with, they need to have an expected frequency of at least 5
  2. If there are more than two categories, then at least 20% of them need to have a frequency of more than 5
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8
Q

How do you determine the df when using chi sq to test normality

A
  1. Population mean and standardiviation are known, k-1
  2. Population mean is known but standard deviation is estimated, K-2
  3. When population and deviation are estimated, k-3
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9
Q

What is the method of determining the degrees of freedom when using chi square to test for independence on a contingency table

A

df = (r-1)(c-1)

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10
Q

How to calculate expected frequency on chi square independence test

A

((row total)*(column total))/grand total

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11
Q
A
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