Taught by Mrs. Going
Students:
Micky Barry, Senior
Nikki Harrod, Senior
Jennifer Sherman, Senior
Cheri Waford, Senior
Amanda Baker, Junior
Brandi Baxter, Junior
Miranda Clubb, Junior
Brandi Hall, Junior
Michelle LeCompte, Junior
Lindsey Morgan, Junior
A Few Topics:
Statistics Links:
Requirements for Tests:
Sigma^2(X+Y) X and Y must be independent
Sigma^2(X+Y) random variables
***All tests are exact when the population is normal.***
Binomial Testing:
*fixed n number of observations
*n observations are all independent
*two categories--success and failure
*probability of success, p, is same for each observation
One and Two-Sample t Tests:
Sample size n < 15 : Use t procedures if data are close to normal. Don't if outliers are present.
Sample size n > 15 : Use t procedures unless outliers or strong skewness is present.
Sample size n > 40 : Use t procedures even when skewness is present, or when there is not more than one outlier.
One-Sample Proportion Tests:
np>10 and n(1-p)>10 *or equal to 10
Two-Sample Proportion Tests:
n1p1, n1(1-p1), n2p2, n2(1-p2) > 5 *or equal to 5
Chi-Square Tests:
2X2: All expected cell counts must be 5 or more.
Larger than 2X2: The average of the expected counts must be 5 or more and the smallest expected count is one or more.
