Sixth-grade and seventh-grade students knit cell phone cases and sell them to raise money for charity. The dot plot displays the number of phone cases knitted by 10 students from each grade.
The mean absolute deviations of the two data sets are both close to 2.
Which statement about the data is true?
A.
The means of the data are different, and since there is variation in the values of the respective mean absolute deviations, the difference is significant.
B.
The means of the data are the same, and since they are within the bounds of the respective mean absolute deviations, the difference is not significant.
C.
The means of the data are different, but since they are more than twice the respective mean absolute deviations, the difference is not significant.
D.
The means of the data are the same, but since there is variation in the values of the respective mean absolute deviations, the difference is significant.