Injuries to Major League Baseball players have been rising in recent years. For the period 1992 to 2001, league expansion caused Major League Baseball rosters to raise 15%. But, the number of players being put on the disabled list because of injury increased 32% over the same period (USA Today, July 8, 2002). A research question addressed whether Major League Baseball players being put on disabled list are on the list longer in 2001 than players put on the disabled list a decade earlier.
a. Using the population mean number of day's player is on the disabled list, formulate null and alternative hypotheses which can be employed to test the research question.
mu1 is the mean number of days on the disabled list for 2001 Season
mu2 is the mean number of days on the disabled list for 1992 Season
H0=________
Ha=________