Arandom 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. find a 99% confidence interval for the difference between the proportions of men and women who have ridden motorcycles.

a. 5 ± .103

b. 5 ± .085

c. 5 ± .112

d. 4688 ± .085

e. 5 ± .078

Option a is right

Step-by-step explanation:

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.

Sample             I            II

N                    250        215     465

X                     175           43    218

p                       0.7          0.2    0.4688

p difference = 0.5

Std error of difference =

Margin of error for 99% = 2.58*std error =  0.105

Confidence interval 99% = (0.5±0.105)            

Option a is right.

in simplified version   it would be x ≤-4

step-by-step explanation:

multiply each term in x ≤-4 by -1