3. Test the hypothesis that the sample mean LOS for MS-DRG 291 is different from the national standard. Obtain the national Medicare standard for LOS from the information provided below. **Be sure to state the null and alternative hypotheses and set the alpha prior to performing the test. Total hospital days for HF are estimated at 6.5 million annually. Although the average length of stay has decreased over the last decade to 6.3 days, the 30-day readmission rate has increased to 20% and is roughly 50% at 6 months .The average MS-DRG (291, 292, and 293) reimbursement is $5,759 for the acute care facility