Lab Report

Sheet1

Sex of Chooser (M/F)	Average Preference (cm)
F	-1.8
F	-1.5
M	-0.6
M	0.9
F	1.2
M	2.6
M	1.2
M	-0.6
F	1.5
M	0.3
F	-0.5
F	0.7
F	-1
M	-0.1
M	4
F	0.3
F	1.3
M	0.9
M	-1.5
F	-0.4
F	-2.9
M	-0.1

We are using confidence intervals because we are assessing the effect of certain traits on mate choice/preference. Confidence intervals are best used when assessing effect. If the confidence intervals overlap, there is no significant difference in preference between males and females. If the confidence intervals extend beyond zero, there is no effect of showiness in males or size of females on mate choice. Assess each bar individually and then together. For example, let's assess the female choice bar first: Does the confidence interval for female choice extend beyond zero? What does this tell you about the effect of male showiness on female preference? Now, compare the female confidence interval with that of the male choice data. Do the erros bars overlap? If so, there is no significant difference between male and female choice/preferences. (You can move this out of the way if needed)