Core 6

Name and Roll No.

Q1. Sampling is inevitable in the situations:

• blood test of a person
• when the population is infinite
• testing the life of dry battery cells
• all the above

Q2. Sampling frame is a term used for:

• a list of random members
• a list of voters
• a list of Sampling units of a population
• (a) and (b)

Q3. Precision of an estimate is

• variance of the estimate
• reciprocal of the variance of the estimate
• equal to the standard error of the estimate
• (a) and (b)

Q4. The number of possible samples of size 2 without replacement from a population of 4 units is

• 2
• 4
• 6
• 8

Q5.If the observation recorded on 5 sampled units are 3,4,5,6,7 then the sample variance is

• 1
• 1.5
• 2
• 2.5

Q6. Cluster Sampling is a good sampling technique when.................. is not available.

Q7. Efficiency of cluster sampling.............. as the cluster size decreases.

Q8. Linear regression is used when regression is linear and the line does not go through the original. True/False.

Q9.If coefficient of variation of x is more than twice that of y, the ratio estimate is always less precise. True/False