A study examined the economic rewards of obtaining an MBA degree. The researchers made inferences based on wage data collected for a sample of individuals who sat for a particular examination required for most MBA programs. The researchers used government wage data for those who took the exam during a selected four-year time period, examining wage data from a two-year period after degrees were obtained. Their wages were compared to those of people who took the exam in the same period and did not obtain their degree. Complete parts a through c below. For this study, describe the population of interest. All people who have an MBA. All those who took the exam during the selected time period. All those who took the exam and are now employed. All people who are employed. What method was used to collect the sample data? The data were collected observationally. The data are from a published source. The data are from a survey. Do you think the final sample is representative of the population? Why or why not? Comment on potential biases in the sample. Yes, because data was also obtained from people who did not get a an MBA. No, because the participants did not volunteer. No, because the data only covers a limited time frame. Yes, because the data of all people who took the exam in the time period were obtained.