A researcher believes that smoking marijuana may impair one’s ability to operate a vehicle safely. To test this, 10 volunteers drive a simulation test first prior to smoking marijuana and then again after smoking it. The researcher measures performance as a number of collisions the driver has. Higher numbers equal worse ability to drive. Test the null hypothesis that there is no difference in driving ability before and after smoking marijuana at the .05 level. Report the test statistics, the degrees of freedom and whether or not the null hypothesis is rejected.
What will be an ideal response?
t = -3.7; degrees of freedom = 9; reject the null hypothesis; there is a difference in driving.
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