Which statement is true of an appropriate sample of a population?
a sample must be a group of people who are the target of the survey question.
a sample should have different characteristics than the population.
a sample must be very small.
a sample should include only boys or only girls.

The correct option is 1.

Step-by-step explanation:

The set of all observations is known as populate set.

A sample is a small subset of population set that is the representative of the entire population. The sample must have sufficient size and it should include all population.

A sample must be a group of people who are the target of the survey question. This statement is true.

Therefore the correct option is 1.

A sample should have different characteristics than the population. This statement is false.

A sample must be very small. This statement is false.

A sample should include only boys or only girls.  This statement is false.

Therefore options 2, 3 and 4 are incorrect.

a.   since the profit made in 2012 is equal to the profit made in 2014, the profit is symmetric about the line y = 120,000.

step-by-step explanation: