Aim: How do we use random sampling?

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Presentation transcript:

Aim: How do we use random sampling?

What is random sampling? Method 1 Most popular method is to place identification of participants on a card, place in a bowl and select as many cards needed at random The subjects whose cards are selected constitute the sample Since it is difficult to mix card thoroughly, there is a chance of obtaining a biased sample Therefore we use another method of generating random samples

What is random sampling? Method 2 The second, more efficient way to obtain a truly random sample is using a generated random number grid 73577 42196 62895 74240 66763 89194 21902 50337 65032 67832 85990 31515 21497 78108 81717 44333 56487 93467 09084 88790 49673 40465 41533 38328 47942 19102 32179 46064 77849 29379 27906 58882 39396 44737 28715 76781 32583 91735 87722 52878 30851 70372 51810 34056 60759 80649 47537 46873 22306 22565 74904 91330 15493 69563 07352 67427 13761 48201 71440 48605 43669 31920 67168 61423 05216 73836 94535 05880 98403 20834 53541 55418 96671 99471 17629 63154 26579 83190 13357 75972 88126 25106 40724 20429 81313 72104 73172 69968 79581 50741 37260 51146 09489 61018 32988 63963 71036 76377 60355 08421

What are random numbers? Random numbers are sets of digits (i.e., 0, 1, 2, 3, 4, 5, 6, 7, 8, 9) arranged in random order. Because they are randomly ordered, no individual digit can be predicted from knowledge of any other digit or group of digits.

What is a random number generator? A random number generator is a process that produces random numbers. Any random process (e.g., a flip of a coin or the toss of a die) can be used to generate random numbers.

What is a random number table? A random number table is a listing of random numbers Based on the following User specifications: The quantity of random numbers desired. The maximum and minimum values of random numbers in the table. Whether or not duplicate random numbers are permitted.

How do we use the random digits? Table A Random Digits (handout) Example: The following 10 students need to be selected at random to enter a contest in their local school newspaper. Use the table of random digits to find their order. Be sure to say where you entered the table and how you used it. Amber Cono Matthew Tom Stephanie Judy Jade Alex Jessica Chris

Class Work Complete Handout