A researcher studies the relationship between the amount of…

A researcher studies the relationship between the amount of time spent studying for an exam and the number of errors made.  A sample of twenty students who have the same GPA are randomly assigned to one of four groups:  1, 2, 3, or 4 hours of study time. After studying the specified time, all students took an identical exam and the number of errors each student made was counted. What is the independent variable?

Based on the stem-and-leaf plot below, representing scores o…

Based on the stem-and-leaf plot below, representing scores on an exam, what was the frequency for a score of 36? 10 : 0  9 : 2  8 : 233  7 : 5  6 :  5 : 00555588  4 : 222  3 : 666  2 : 777  1 : 7  0 : 8 *each stem represents the hundreds and tens place; each leaf represents the ones place