14.2 Data were collected from 10 major oil well drilling operators that recorded the number of hours lost per week due to work-related accidents.

A rigorous safety program was instituted, and the number of lost hours was once again recorded following the introduction of the safety program. The presafety program values are 41, 55, 63, 79, 45, 120, 30, 15, 24, and 24. The postsafety program values are 32, 49, 50, 73, 43, 115, 32, 9, 22, and 19.

A research consultant was hired to examine the data and determine if the safety program significantly changed the weekly hours lost from on-job injuries. Write the null and alternative hypotheses, and select and conduct the appropriate test to seek evidence that the program was successful.