Need the correct answer as i am practicing with the reference book and the answers are not available i have done the solution but need to confirmed the answers.

Which of the following is a subset of population?

1. distribution
2. data
3. sample
4. set

Selection of a football team for FIFA World Cup is called as?

1. systematic sampling
2. random sampling
3. cluster sampling
4. purposive sampling

If the mean of population is 29 then the mean of sampling distribution is __________

1. 21
2. 31
3. 30
4. 29

Skewness of Normal distribution is ___________

1. 0
2. Positive
3. Undefined
4. Negative

For a standard normal variate, the value of Standard Deviation is ___________

1. not defined
3. 1
4. 0