Need help with these 3 Multiple Choice Questions

**1. **

(Points: 1)

The researcher should use which type of sampling if the researcher wants to know characteristics of certain subgroups of the population.

1. simple random sampling

2. convenience sampling

3. orthogonal sampling

4. stratified random sampling

**2. **

(Points: 1)

A parameter is:

1. a value obtained by using information from all the individuals of the population

2. a sample statistic

3. a value obtained by using information from the individuals of a sample

4. a representative sample from a population

**3.**

__Number __

1-3

4-6

7-9

10-12

13-15

16-18

__Frequency__

16

22

27

55

30

22

The midpoint of the bottom class on the table is:

1. 22

2. 17.5

3. 16-18

4. 17