sampling 2

sampling 2 - SAMPLING AND POPULATIONS, PART 2 Social...

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SAMPLING AND POPULATIONS, PART 2 Social Research Methods Professor Kutz-Flamenbaum rflamenb@pitt.edu / WWPH 2421
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Simple Random Sample (SRS) All elements have an equal chance of being selected. Basic and most common version of a probability sample. The larger the sample the closer it will come to looking like the population. Need to minimize or eliminate bias and error. How can we get a random sample?
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How do we make sure that everyone has an equal chance of being represented? I want a sample of 10 students in the class. Non-randomly– ask the ones that entered class first, ask the ones in the front of the room, ask the ones who look like they are asleep. Why wouldn’t this be representative?
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Random Number Table 1 5965 2913 5612 6361 7075 5490 9626 4307 0840 7945 5801 9383 6173 9465 2 9236 5543 5811 5520 5814 7864 1223 5344 3649 6397 1678 4400 7715 0589 3 7614 1209 7729 0220 2108 0784 8837 3916 0282 4490 3442 6471 6593 5464 4 4131 9772 7594 8863 0874 1864 8117 6411 7012 2682 3074 5746 2723 0686 5 5681 0989 8015 0818 5380 9981 3758 2939 6585 6658 7756 7916 9770 1266 6 2868 2128 2665 2386 6003 5982 8829 2833 8160 2101 3365 4121 4522 4341 7 8216 2039 2993 4362 6363 2914 4955 6364 5237 6456 5561 0176 2425 9760 8 2968 3834 6077 4302 3499 9938 7231 2136 2161 1365 2764 7836 1584 9608 9 2421 4247 2930 0783 9989 0407 1760 7048 1929 9034 0242 0753 4851 0791 10 0055 7981 7760 2215 3323 4727 8884 8066 7965 3939 0726 2104 9164 6275 11 4073 1715 3215 7883 8087 2475 9583 8713 1445 2702 4952 4307 5796 2913 12 5773 7394 9333 4752 8395 4223 4033 3734 8221 2055 5131 0065 1626 7742
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sampling 2 - SAMPLING AND POPULATIONS, PART 2 Social...

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