a) Suppose you have to select 10 out of 100 households
in a locality. You have to decide which household to
select and which to reject. You may select the household
conveniently situated or the households known to you or
your friend. In this case, you are using your judgement
in selecting 10 households. This way of selecting 10 out
of 100 households is called a ------(random/non-random)
sampling
Answers
Answer:
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Answer:
Sampling Methods
Sampling Methods can be classified into one of two categories:
Probability Sampling: Sample has a known probability of being selected
Non-probability Sampling: Sample does not have known probability of being selected as an inconvenience or voluntary response surveys
Probability Sampling
In probability sampling, it is possible to both determine which sampling units belong to which sample and the probability that each sample will be selected. The following sampling methods are examples of probability sampling:
Simple Random Sampling (SRS)
Stratified Sampling
Cluster Sampling
Systematic Sampling
Multistage Sampling (in which some of the methods above are combined in stages)
Of the five methods listed above, students have the most trouble distinguishing between stratified sampling and cluster sampling.
Stratified Sampling is possible when it makes sense to partition the population into groups based on a factor that may influence the variable that is being measured. These groups are then called strata. An individual group is called a stratum. With stratified sampling one should:
partition the population into groups (strata)
obtain a simple random sample from each group (stratum)
collect data on each sampling unit that was randomly sampled from each group (stratum)
Stratified sampling works best when a heterogeneous population is split into fairly homogeneous groups. Under these conditions, stratification generally produces more precise estimates of the population percents than estimates that would be found from a simple random sample. Table 2.2 shows some examples of ways to obtain a stratified sample.
Explanation:
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