Stats 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)
 Author: mangoboba ID: 42773 Card Set: Stats Ch9 Definitions Updated: 2010-10-17 19:22:27 Tags: statistics Folders: Description: ch9 definitions Show Answers: