Data from a cross-sectional study on tanning bed use and skin cancer are presented in the 22 table below. Use www.openepi.com. to obtain point estimates and confidence intervals. Report numeric answers to the same number of decimal places as shown in the output of OpenEpi program. Use 2x2 Tables in OpenEpi, and then pick values reported in the output printed under "Risk-Based* Estimates and 95% Confidence Intervals" to answer the following questions.

	Tanning +	Tanning	TOTAL
Skin Cancer +	25	15	40
Skin Cancer	100	360	460
TOTAL	125	375	500

This question has three parts based on the results from OpenEpi.com:

(1) What is the prevalence difference?

(2) What is the 95% confidence interval for the prevalence difference?

(3) Based on the prevalence difference and 95% confidence interval, is there a significant association between tanning bed use and skin cancer?