June 2013
Intermediate to advanced
352 pages
12h 28m
English
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10
FIFTY–FIFTY = 50%?
CARNEGIE MELLON UNIVERSITY, USA
© 1999 JOHN WILEY AND SONS, LTD.
Abstract
Several recent surveys have asked respondents to estimate the probabilities of relatively unlikely events, such as dying from breast cancer and smoking. Examination of their response distributions reveals a seemingly inappropriate ‘blip’ at 50. The two studies reported here indicate that it reflects a response artifact associated with open-ended probability scales. The blip vanishes when a response scale with explicit response options is offered. Apparently, the open-ended format leads some people to use the 50% option as ‘fifty–fifty’, an expression of having no idea as to the answer. As a result, the accuracy ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.