# significance level handedness

• Sep 9th 2008, 05:23 PM
wik_chick88
significance level handedness
The phenomenon of handedness has been extensively studied in human populations. The percentages of adults who are right-handed, left-handed, and ambidextrous are well documented. What is not so well-known is that a similar phenomenon is present in other (cuter, fuzzier) animals. Dogs, for example, can be either right-pawed or left-pawed. In a random sample of 200 beagles, it was found that 55 were left-pawed and in a random sample of 200 collies 40 were left-pawed. Can we conclude that there is a statistically significant difference in the proportion of left-pawed beagles and collies? Use a significance level of a = 0.05.
• Sep 9th 2008, 09:38 PM
mr fantastic
Quote:

Originally Posted by wik_chick88
The phenomenon of handedness has been extensively studied in human populations. The percentages of adults who are right-handed, left-handed, and ambidextrous are well documented. What is not so well-known is that a similar phenomenon is present in other (cuter, fuzzier) animals. Dogs, for example, can be either right-pawed or left-pawed. In a random sample of 200 beagles, it was found that 55 were left-pawed and in a random sample of 200 collies 40 were left-pawed. Can we conclude that there is a statistically significant difference in the proportion of left-pawed beagles and collies? Use a significance level of a = 0.05.

Have you tried using the t-test? Student's t-test - Wikipedia, the free encyclopedia
• Sep 14th 2008, 04:04 PM
wik_chick88
i attempted to use the t-test using 1 for left-handedness and 0 for right-handedness so the means are: X1 (beagles) = 0.275 and X2 (collies) = 0.2. i got t = 0.082402346 is this right? and what does this mean for the question ie. a = 0.05??