Stats Ch9 Definitions

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Author:
mangoboba
ID:
42773
Filename:
Stats Ch9 Definitions
Updated:
2010-10-17 15:22:27
Tags:
statistics
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Description:
ch9 definitions
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  1. T/F Standard error determines how much difference is reasonable to expect between pop mean and sample mean
    T
  2. Sample Variance formula
    s2= SS/(n-1) = SS/df
  3. sample standard deviation formula
    • s=
    • square root of SS/(n-1)
  4. estimated standard error formula (used for t scores)
    Sm = square root of s2/n
  5. t score formula
    t=M-m/Sm
  6. T/F the greater the favlue of df for a sample, the better s2 represents o2; the better the t statistic approximates the z score.
    t
  7. T/F t distribution has the same shape as z
    F: t is flatter and more variable than Z. Larger the df, the more closely T resembles Z
  8. Cohen's D formula/estimated D formula
    Cohen's D= mean difference/standard deviation (M-m/s)
  9. r2 is the measure of effect size. Formula?
    r2=t2/(t2+df)

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