Stats Ch. 10

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12 Terms

1
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sampling distribution of a difference between two proportions

  • Center

  • Shape

  • Spread

2
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formula of pooled proportion

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3
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Normal condition for difference of proportions

Large counts - the counts of “successes” and “failures” in each sample or group are all at least 10

<p>Large counts - the counts of “successes” and “failures” in each sample or group are all at least 10</p>
4
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spread: standard deviation of sampling distribution of difference between two means

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5
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10% condition

each sample is no more than 10% of its population

6
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Conditions for performing inference about µ1 - µ2

  • SRS

  • Independence

  • Normal

7
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Independence condition

When sampling without replacement, check that N1 >= 10n1 and N2 >= 10n2

<p>When sampling without replacement, check that N<sub>1</sub> &gt;= 10n<sub>1</sub> and N<sub>2</sub> &gt;= 10n<sub>2</sub></p>
8
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Do not use two-sample t procedures if the graph shows strong skewness or outliers.

True

9
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Significance tests for µ1 – µ2

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10
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Ha: µ1 – µ2 > hypothesized value

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11
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Ha: µ1 – µ2 < hypothesized value

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12
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Ha: µ1 – µ2 ≠ hypothesized value

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