The dot plot shows the results of two random samples measuring the mean time, in hours, spent working out in a given week. Which statement is true?
a The students in sample 1 are better at taking tests than the students in sample 2 because the mean study time in sample 1 is noticeable less than the mean study time in sample 2.
b The students in sample 1 are better at taking tests than the students in sample 2 because the mean study time in sample 1 is noticeable greater than the mean study time in sample 2.
c The study time spent by the students in sample 1 varies more than the study time spent by the students in sample 2 because the range for sample 1 is larger.
d The study time spent by the students in sample 1 and the study time spent by the students in sample 2 vary by the same amount because the ranges are equal.
