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t-test t-test is frequently used to test differences in means for two datasets. Independent data set A clinical trial tests for the effect of a cholesterol lowering drug gives the following results:
placebo drug
200 205
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200 205
220 195
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190
H0 The null hypothesis: the mean cholesterol level for the drug-treated group = mean cholesterol level for
the placebo group.
Ha The alternative hypothesis: the mean cholesterol level for the drug-treated group < mean cholesterol level for the placebo group. Using one-tailed t-test for independent samples, we find p = 0.12. The null hypothesis cannot be rejected in favor of the alternative hypothesis, i.e., the drug is not effective. Dependent data set (paired) A clinical trial tests for the effect of a cholesterol lowering drug gives the following results: Before After treatment treatment 200 205 215 220 225 220 230 225 210 220 210 205 200 205 220 195 195 200 205 195 200 190H0 The null hypothesis: the mean cholesterol level is the same after drug treatment. Ha The alternative hypothesis: the mean cholesterol level is lower after drug treatment. Using one-tailed t-test for dependent (paired) samples, we find p = 0.20. The null hypothesis cannot be rejected in favor of the alternative hypothesis, i.e., the drug is not effective.  What is a USB Flash Disk? | |