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# Stats - t and 2 χ distributions • Standard Deviation...

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1 Population Hypothesis Test Flow Chart Proportions Variance What are we testing? Is σ known? YES n s x z μ = + < < n s z x n s z x 2 2 α NO n s x t = + < < n s t x n s t x 2 2 Does the normal approx. apply? Mean Top formula is the test statistic. The , , p are the obtained from the alternative hypothesis. It is what you are testing the population parameter against. Bottom formula is the confidence interval formula. The , , p are not values but remain symbols. Note: The confidence interval contains all the values used in the test statistic. Degrees of Freedom, d.f., is n-1 . D.f. is needed for the chart values obtained using
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Unformatted text preview: t and 2 χ distributions. • Standard Deviation Confidence Interval: Take the square root for the confidence interval obtained using the variance. YES, n x z − = + < < − n z x n z x 2 2 NO Is ? 30 ≥ n YES n pq p p z − = ˆ + < < − n q p z p p n q p z p ˆ ˆ ˆ ˆ ˆ ˆ 2 2 NO We will not discuss. 2 2 2 ) 1 ( s n − = 2 2 1 2 2 2 2 2 ) 1 ( ) 1 ( − − < < − s n s n...
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## This document was uploaded on 02/23/2010.

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