Question

9. National statistics show that 23% of men smoke and 18.5% of women do. A random sample of 180 men indicated that 50 were smokes, and of 150 women surveyed, 39 indicated that they smoked. Construct and interpret a 98% confidence interval for the true difference in proportions of male and female smokers. Does your interval support the claim that there is a difference?

Answer 1

Answer:

Given that:

National statistics show that 23% of men smoke and 18.5% of women smoke.

Sample properties

let los be (from z-table)

98% C.I=

...........> Since the above confidence interval contains '0'.So the result is not significant.

therefore We can't conclude that there exit difference between the properties of male and female smokers.