The Department of Motor Safety is conducting a study to determine how many hours each week car and truck drivers drive. In order to assess this, they equipped special trackers in 50 cars and trucks....

The Department of Motor Safety is conducting a study to determine how many hours each week
car and truck drivers drive. In order to assess this, they equipped special trackers in 50 cars and
trucks. They received the following information:

Truck Drivers Car Drivers
X̄ = 19.5
s = 4.75
n = 50

X̄ = 17
s = 3.5
n = 50
1. What is the null and research hypothesis for this study?