An investigator conducts a statistical test to determine whether the difference between the experimental group and the control group was statistically significant. Other things being equal, the difference is most likely to be significant if

A) the standard deviation was high for each group.
B) the mean of one group was much larger than the mean of the other group.
C) both groups had a small number of participants.
D) the mean for each group was about the same size as the standard deviation.

The difference between the experimental group and the control group is more likely to be significant if the mean of one group is much larger than the mean of the other group. This is because the larger the difference between the means, the less likely it is that the difference is due to chance. A high standard deviation can make it difficult to detect differences between groups, a small number of participants can decrease the statistical power of the test, and having means around the same size as the standard deviation can make it difficult to interpret the results.