Final answer:
The conclusion that people with a master's degree in business administration (MBA) earn an income on average 70% higher than people with just an undergraduate degree does not follow.
Step-by-step explanation:
The conclusion that people with a master's degree in business administration (MBA) earn an income on average 70% higher than people with just an undergraduate degree does not follow.
Based on the information provided, it is stated that MBA students from top business schools earn an income on average 50% higher than the average income of people with MBAs. However, this does not necessarily imply that the average income of an MBA graduate from a top business school is over double that of the average income of a person holding only an undergraduate degree.