Final answer:
The number of students in the sample can be determined by looking at the data in the variable 'score' or 'econhs' in the ECONMATH dataset. To find out how many students report taking an economics course in high school, you can look at the 'econhs' variable.
Step-by-step explanation:
The number of students in the sample can be determined by looking at the data in the variable 'score' or 'econhs' in the ECONMATH dataset. Each data entry in these variables represents a student. Therefore, the number of students in the sample is equal to the number of data entries in the variables 'score' or 'econhs'.
To find out how many students report taking an economics course in high school, you can look at the 'econhs' variable. Count the number of data entries where 'econhs' is equal to 1. This will give you the number of students who report taking an economics course in high school.