Two test preparation companies claim that students are
guaranteed to score between 85% and 100% on a test of math
skills after using their materials. A researcher decides toevaluate the claims by randomly selecting two groups of 25
students and giving each group a different set of materials. The line plots show the results. Based on these samples, which statement is true about the materials from the two companies?
The mean scores and the range of scores for the two groups are different.
The mean scores for the two groups are the same,
but the range is different.
The mean scores for the two groups are different, but the range is the same.
The mean score and the range of scores for the two groups are about the same.
