Stats Midterm Updated Flashcards

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14 Terms

1
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What is population parameter?

the total number of people in a certain demographic (mu symbol)

2
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What is a point estimate?

a sample of people from the population parameter (x bar)

3
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What is standard error formula for single proportion? s

sqrt of phat (1-phat)/n

4
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formula for z test

x bar - null value/(stand dev/sqrt n)

5
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Conditions for 2 proportions

p1 greater than or equal to 10, 1-p1 greater or equal to 2, p2 greater than or equal to 2, 1-p2 greater than or equal to 2.

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z score stat

phat-p null/sqrt (p null*1-pnull/n)

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Standard error for mean/t stat

s/sqrt of n

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Chi Square Excel Function

(x²,df,True)

9
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T Test Interval Excel Formula

(p,df)

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T Distribution Formula

(t,df,TRUE)

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Normal Distribution Interval

Norm.S.Int(percent,p)

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Standard error for t test

s/sqrt of n

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p pooled formula

phat1*n1 + phat 2*n2/n1+n2

14
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Confidence Interval Values for 99, 95, 90

2.58, 1.96, 1.65