Question

#11 a professor at neumann university asked all of the students in her class their ages. on the basis of this information, the professor then claims that the average age of all the students in her class is 20 years. this is an example of: (a) an observational study (b) an experimental study (c) descriptive statistics (d) inferential statistics #12 referring to question #11 above, suppose that professor were to claim that the average age of all the students at neumann university is 20 years. this is an example of: (a) an observational study (b) an experimental study (c) descriptive statistics (d) inferential statistics

Explanation:

For #11, descriptive statistics summarize data from a sample. The professor calculated the average age of students in her class (the whole sample here), which is a descriptive - statistic measure. For #12, inferential statistics make inferences about a population based on sample data. The professor is making a claim about all students at the university (the population) based on the data from her class (a sample).

Answer:

#11: C. descriptive statistics
#12: D. inferential statistics