1. A study was done to determine whether the amount of money spent on soft drinks was related to mortality from diabetes. The investigators collected data on per capita (average per person) soft drink consumption in ten US states and examined its relationship to mortality rates from diabetes in those ten states. In order to calculate per capita sales, they gathered annual data on soft drink sales from commerce records and then divided these figures by the state's population from the most recent census. The mortality data were gathered from the vital records department in each state. Here are the data that they collected.+ US State Annual per Capita Soft Annual Diabetes Mortality Drink Sales ~ Rate (per 100,000 population)+ Massachusetts $150- 2072 New York $300. 353. Florida $500 688 Alabama $700- 801- Alaska $50. 75. California $500- 605 Nevada $200 310. Idaho $250 325. Ohio $400- 454- Arkansas $350- 4052 Unfortunately, the investigators had never taken and epidemiology course and did not acknowledge any limitations of their study. Briefly describe two major limitations that they should have acknowledged