A researcher tested a treatment and a control group in an experiment with 15 subjects in each group. Although a t-test indicated the means for the dependent variable were not statistically different, the effect size for the independent variable was .50. A power analysis revealed that the power of the study was .26. This means that
A. the difference between means in the experiment was .26.
B. the value of the t¬-statistic is 0.13 (.50 ? .26).
C. a statistically significant outcome would be obtained in approximately 1 in 4 attempts with this sample size and effect size.
D. the probability of obtaining a statistically significant difference for this experiment is .74 (1 - .26).
C. a statistically significant outcome would be obtained in approximately 1 in 4 attempts with this sample size and effect size.
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