Understanding Standard Deviation in Exam Scores

A researcher is studying the effects of a new study technique on students' exam scores. After implementing the new technique, the researcher gathers data from two groups of students: one group that used the study technique and another group that did not. The researcher records the exam scores and finds the mean score of the experimental group is 85, while the control group's mean score is 75. To analyze the data further, the researcher calculates the standard deviation for both groups.

Based on this scenario, which of the following statements about the standard deviation is most accurate?