In a memory test,the test of statistical significance used showed a probability of .025 that the group mean of the experimental group and the group mean of the control group would differ as much as they do by chance alone.This allows us to
A) estimate the percent of variance between the two group means.
B) establish a normal curve, regarding the memory score changes that occurred.
C) calculate the measures of central tendency and measures of variability for this experiment.
D) conclude with reasonable certainty that the drug actually did improve memory scores.

Question

Quizplus · Accepted Answer

The probability of .025 means that there is a 2.5% chance that the difference in the group means is due to chance alone. This level of probability is typically considered statistically significant, which means there is strong evidence that the drug actually improved memory scores beyond what would occur by chance. Therefore, we can conclude with reasonable certainty that the drug had a significant effect on memory scores.

In a Memory Test,the Test of Statistical Significance Used Showed