This topic contains a solution. Click here to go to the answer

Author Question: In a random sample of 500 people aged 20-24, 22 were smokers. In a random sample of 450 people aged ... (Read 82 times)

cherise1989

  • Hero Member
  • *****
  • Posts: 555
In a random sample of 500 people aged 20-24, 22 were smokers. In a random sample of 450 people aged 25-29, 14 were smokers.
 
  Do the data provide sufficient evidence to conclude that the proportion of smokers in the 20-24 age group is different from the proportion of smokers in the 25-29 age group? Use a significance level of 0.01.

Question 2

Suppose that you know the area under the standard normal curve to the right of 2 and the area under the standard normal curve to the right of 1.
 
  Without further consulting a table of areas, how could you find the area under the standard normal curve between 1 and 2? Explain your reasoning.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

bdobbins

  • Sr. Member
  • ****
  • Posts: 326
Answer to Question 1

H0: p1 = p2, Ha: p1  p2.
 = 0.01
Test statistic: z = 3.19. P-value = 0.0014
Reject the null hypothesis. At the 1 significance level the data provide sufficient evidence to conclude that the proportion of smokers in the 20-24 age group is different from the proportion of smokers in the 25-29 age group.

Answer to Question 2

The area under the standard normal curve between 1 and 2 can be found by subtracting the area to the right of 2 from the area to the right of 1.




cherise1989

  • Member
  • Posts: 555
Reply 2 on: Jul 25, 2018
Great answer, keep it coming :)


apple

  • Member
  • Posts: 352
Reply 3 on: Yesterday
Gracias!

 

Did you know?

Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

Did you know?

Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

Did you know?

As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.

Did you know?

The average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.

Did you know?

A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.

For a complete list of videos, visit our video library