 Wysłany: Śro 14:55, 09 Mar 2011 Temat postu: On the Makaloa Mat LondonJack Publishedaanfod |
|
| ution
There are no ideal solutions to these problemsother than trying to design experi- ments that can be performed in a natural setting with a random sample from the pop- ulation of interest. In most experimental workthese idealistic solutions are impossible. A partial solution is to measure variables for which the volunteers might differ from the general populationsuch as incomeageor healthand then try to determine the extent to which those variables would make the results less general than desired. In any casewhen you read the results of a studyyou should question its ecological validity and its generalizability. REAL SMOKERS WITH A DESIRE TO QUIT The researchers in Case Study 5.1 did many things to help ensure ecological validity and generalizability. Firstthey used a standard intervention program available from and recommended by the National Cancer Institute instead of inventing their own so that other physicians could follow the same program. Next they used participants at three different locations around the countryrather than in one community onlyand they involved a wide range of ages (20 to 65). They included individuals who lived in households with other smokers as well as those wh mens discount shoesyilai: nike high heels nike heels for women louis vuitton outlet http://leetstreams.com/profile_blogs/yixian005/&action=view&id=193406 |
|
