An auto analyst would like to know what kind of cars (domestic, European, Japanese, Others) people are driving in USA. He randomly sampled 20 drivers and got the following results (D=domestic, E=European, J=Japanese, O=others):
D J O D J J D D E E E J D D E J J J J D
(a) What is the population and what is the sample in this study?
(b) What is the variable of interest in this data set and what is the type of this
variable?
(c) Construct a relative frequency table for the kind of cars in this data set.
(d) What is the proportion of cars that are domestic?
(e) Use an appropriate graphical method to describe the data.
(f) Based on your results, can you infer what kind of cars people are driving in Japan?