A researcher has just designed a new in-car navigation system with additional au

Question

A researcher has just designed a new in-car navigation system with additional auditory cues, as well as ‘improved’ visual displays (when compared to the systems currently available commercially). She wants to test whether this ‘improved’ design actually leads to less distraction, and therefore, better driving performance than previous models. She compares the driving performance (measured as the deviations from the center of the lane) for drivers using her ‘improved’ system and drivers using the commercially available navigation system that obtained the best ratings in the latest consumer reports. Would you use a one- or a two-tailed test? Why?

a) Ho: m                   m               

b)   Ha: m                   m              

Explanation / Answer

She wants to test whether this ‘improved’ design actually leads to less distraction, and therefore, better driving performance than previous models.

hence this is directional

so this is one-tailed test

Ho : ma = mb

Ha: ma > mb

ma- mean of previous model

mb- mean of new model

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