sample survey of the opinions of the engineers of a small corporation is conducted. The results of the sample indicate that average salary is $45,980 and 60% have advanced degrees in either business or engineering. Which of the following statement is true?

1. The average salary and the proportion of those with advanced degrees are statistics.
2. The population of interest is all the engineers in the industry.
3. The results of the sample should be represented by symbols such asand

I only

II only

I and III only

I,II,and III