Sampling and Its Types

Q.

Which Of The Following Package Contains The Random Class?

1. Java.io package

2. Java.awt package

3. Java.util package

4. Java.lang package

Q.

which of these is not a method of data collection?

1. Observation

2. Experiment

3. Questionaries

4. Interviews

Q.

You want to know the number of students in your state who have summer jobs. Determine whether you should survey the population or a sample. Explain.

Q. Assertion (A) : The results derived from the sample may not be true to the population.
Reason (R) : The samples are only a portion of the population.

1. Both (A) and (R) are true, and (R) is the correct explanation of (A)..
2. (A) is true but (R) is false.
3. Both (A) and (R) are true, but (R) is not the correct explanation of (A)
4. (A) is false but (R) is true.