Pet 58 64 65 68 69 69 69 70 70 72 76 79 85 86 99 Friend 76 80 81 83 87 88 89 91 92 97 98 99 100 101 102 Alone 62 70 73 75 77 80 84 84 84 87 87 87 90 91 99 1. Use the rule to show that 99 is an outlier for the Pet group.
2. Use the applet to make parallel boxplots to compare the heart rates in the three groups.
3. Based on the data, does it appear that the presence of a pet or friend reduces heart rate during a stressful task? Justify your answer.