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6. When production is heterogeneous, it is divided into groups, so that there is homogeneity within the group and heterogeneity between the groups and some items are selected at random from each group. It is a case of
Cluster Random Sampling
Systematic Random Sampling
Quota Sampling
Stratified Random Sampling
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7. F= S12/S22 is a
t-test
F -test
z- test
mean test
8. Sampling distribution of mean is very close to the standard normal distribution when
The population is normally distributed
The population is not normally distributed but the sample size is large
Both (A) and (B)
Neither (A) nor (B)
9. Which one of the following factors cause non-sampling errors
Inappropriate statistical units
Inadequate sampling frame
Faulty process of selection
All of the above
10. Regression analysis is a measure of
Degree and direction of the relationship
Degree of association
Cause and effect relationship
None of the above
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