This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: In a random sample of 500 people aged 20-24, 22 were smokers. In a random sample of 450 people aged ... (Read 84 times)

cherise1989

  • Hero Member
  • *****
  • Posts: 555
on: Jul 25, 2018
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
Reply #1 on: Jul 25, 2018
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
Wow, this really help

daiying98

  • Member
  • Posts: 354
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

Blastomycosis is often misdiagnosed, resulting in tragic outcomes. It is caused by a fungus living in moist soil, in wooded areas of the United States and Canada. If inhaled, the fungus can cause mild breathing problems that may worsen and cause serious illness and even death.

Did you know?

People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

Did you know?

Nearly all drugs pass into human breast milk. How often a drug is taken influences the amount of drug that will pass into the milk. Medications taken 30 to 60 minutes before breastfeeding are likely to be at peak blood levels when the baby is nursing.

Did you know?

Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

Did you know?

More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.

Blood glucose measurement. A postprandial test may be self-administered. (a) A lance pierces the ski Blood glucose measurement. A postprandial test may be self-administered. (a) A lance pierces the ski
Sample Problem from Raven’s Progressive Matrices Sample Problem from Raven’s Progressive Matrices
How People Match Their Goals to Their Means How People Match Their Goals to Their Means
How long does it take for 90% of a sample of strontium-90 (half-life of 28.8 years) to decay? How long does it take for 90% of a sample of strontium-90 (half-life of 28.8 years) to decay?
Government By the People, 2016 Presidential Election, 26th Edition Government By the People, 2016 Presidential Election, 26th Edition
A 31.1-g sample of Ne gas exerts a certain pressure in a container of fixed volume. What mass ... A 31.1-g sample of Ne gas exerts a certain pressure in a container of fixed volume. What mass ...
Video: Replication of DNA and Chromosomes/ How do cells replicate their DNA? (Animation) no Audio

For a complete list of videos, visit our video library