A Random Sample of Toronto Car Commuters Is Compared to a Random

Multiple Choice

A random sample of Toronto car commuters is compared to a random sample of Toronto bike commuters. After analyzing post-commute stress levels, researchers fail to reject the null hypothesis. Which of the following could they conclude?

A) Car commuters and bike commuters differ significantly in their levels of post-commute stress.
B) Car commuters are more stressed after their commutes than are bike commuters.
C) The difference between the groups is significant, but it is impossible to determine which group is more stressed.
D) Any difference in stress between car commuters and bike commuters is no greater than could have occurred by chance alone.