RQ., Volumen14Reference and User Services Association, 1974 |
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Página 21
... sample . This range would be con- ventionally expressed as 34,000 ± 1,700 . For the purposes of our formula we should express the degree of precision in terms of the range of questions per day , which in our hypothet- ical case would be ...
... sample . This range would be con- ventionally expressed as 34,000 ± 1,700 . For the purposes of our formula we should express the degree of precision in terms of the range of questions per day , which in our hypothet- ical case would be ...
Página 22
... sample size . Instead of our unknown in the formula being sample size , it will be the sample's precision . Substituting the new values in the rearranged formula , we have Formula 2 for precision . FORMULA 2 ď n N - n N 324 ď 3.84 x X ...
... sample size . Instead of our unknown in the formula being sample size , it will be the sample's precision . Substituting the new values in the rearranged formula , we have Formula 2 for precision . FORMULA 2 ď n N - n N 324 ď 3.84 x X ...
Página 23
... sample it will com- prise 50 percent of the yearly total of ques- tions . As a practical matter , however , the various categories in our sample will corre- spond closely on a percentage basis to the cate- gories in the population as a ...
... sample it will com- prise 50 percent of the yearly total of ques- tions . As a practical matter , however , the various categories in our sample will corre- spond closely on a percentage basis to the cate- gories in the population as a ...
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Katherine Emerson | 7 |
tal Guidelines | 24 |
Alan Edward Schorr | 32 |
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