An investigator wishes to determine whether the difference between two groups of participants is statistically significant. To answer that question, the investigator must first determine the difference between the means of the two groups, the number of participants in each group, and

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In order to determine whether the difference between two groups of participants is statistically significant, the investigator must also calculate the amount of variation in each group. This can be done by calculating the standard deviation of each group. This information is necessary to determine the level of precision in the estimates of the means and the difference between them. Understanding the amount of variability in each group is critical to determining whether the observed difference between the means is due to chance or whether it represents a true difference between the groups.

An Investigator Wishes to Determine Whether the Difference Between Two