An intervention program was implemented to improve the work conditions of a city’s bus drivers. Researchers collected physiological and psychological data for bus drivers who drove on the improved...

An intervention program was implemented to improve the work conditions of a city’s bus drivers. Researchers collected physiological and psychological data for bus drivers who drove on the improved routes (intervention) and for drivers who were assigned the normal routes (control). Following are summary statistics for the heart rates, in beats per minute, of the intervention and control drivers.

Use the nonpooled t-test to answer the following: At the 5% significance level, do the data provide sufficient evidence to conclude that the intervention program reduces mean heart rate of urban bus drivers in this city? (Note: df = 25)

Write the hypotheses for the nonpooled t-test.

H0:__________________________                       Ha:__________________________________