10 - October 9 Sampling-Experimental Design

10 - October 9 Sampling-Experimental Design - "Time is the...

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"Time is the coin of your life. It is the only coin you have, and only you can determine how it will be spent. Be careful lest you let other people spend it for you." - Carl Sandburg
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Statistical  Significance An observed effect so large that it  would rarely occur by chance .
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Population Population
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Sample Sample
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Sampling Frame Sampling Frame The list of units from which a sample is chosen
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Built in Bias Built in Bias Convenience Sample Voluntary Response
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Randomness Randomness Simple Random Sample (SRS): A sample of N units from the sampling frame chosen in such a way that every possible group of N units has the same chance of being chosen. Random - Fair - Representative - Unbiased
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Random Sample Random Sample Designs Designs Simple Multi - Stage Systematic Stratified Cluster Hybrid
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Simple Random Sample Simple Random Sample Every unit in sampling frame has an equal chance of being selected. Possible shortcomings - Bias due to poor sampling frame - Cost of sampling
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Random Digits Table Random Digits Table Row <------------------- uniform random digits --------------------> 1 57245 39666 18545 50534 57654 25519 35477 71309 12212 98911 2 42726 58321 59267 72742 53968 63679 54095 56563 09820 86291 3 82768 32694 62828 19097 09877 32093 23518 08654 64815 19894 4 97742 58918 33317 34192 06286 39824 74264 01941 95810 26247 5 48332 38634 20510 09198 56256 04431 22753 20944 95319 29515 6 26700 40484 28341 25428 08806 98858 04816 16317 94928 05512 7 66156 16407 57395 86230 47495 13908 97015 58225 82255 01956 8 64062 10061 01923 29260 32771 71002 58132 58646 69089 63694 9
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