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For my first sample of data I chose to use the stratified sampling. I broke the numbers
down into groups to see which numbers were on there more than once. So the groups
would be once, twice, three times and so on. I chose ten numbers that were in the group
“twice”: 48,48, 58,58,60,60,74,74,80,80. The mean came out to be 64 and the standard
deviation was 12.1.
Nonprobability sampling:
Convenience sampling:
Pro: It’s easy to use, say you were taking surveys you would just walk up to the first
people you saw until you reached your limit.
Con: You wouldn’t be able to see if these people represented the average population.
What if the survey you were doing was on a restaurant and the ten people that you first
came to hated it. That wouldn’t be for the whole population.
Judgment sampling:
Pro: You would be using people who knew about the info you were sampling most
commonly experts.
Con: What if the socalled experts were not really experts you could get a lot of false
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This note was uploaded on 02/25/2011 for the course STATISTICS WL110 taught by Professor Talton during the Winter '11 term at National American.
 Winter '11
 talton

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