A random sample of 250 men yielded 175 who said they'd ridden a motorcycle at some time in their lives, while a similar sample o
f 215 women yielded only 43 that had done so. Find a 99% confidence interval for the difference between the proportions of men and women who have ridden motorcycles. a. .5 ± .103
Given that a random sample of 250 men yielded 175 who said they'd ridden a motorcycle at some time in their lives, while a similar sample of 215 women yielded only 43 that had done so.
For proportions since binomial and sample size large we can use z critical values.