« previous next »

Author Question: The Bureau of Labor Statistics reported that the average yearly income of dentists in the year 2012 ... (Read 63 times)

wenmo

  • Hero Member
  • *****
  • Posts: 540
on: Jun 24, 2018
The Bureau of Labor Statistics reported that the average yearly income of dentists in the year 2012 was 110,000 . A sample of 81 dentists, which was taken in 2013, showed an average yearly income of 120,000 . Assume the standard deviation of the population of dentists's incomes in 2012 is 36,000.
 a. We want to test and determine if there has been a significant increase in the average yearly income of dentists. Provide the null and the alternative hypotheses.
  b. Compute the test statistic.
  c. Determine the p-value; and at a 5 level of significance, test the hypotheses.

Question 2

A description of how the probabilities are distributed over the values the random variable can assume is called a(n) _____.
 a. probability distribution
  b. probability function
  c. random variable
  d. expected value


jxjsniuniu

  • Sr. Member
  • ****
  • Posts: 343
Reply #1 on: Jun 24, 2018
Answer to Question 1

a. H0:   110,000
Ha:  > 110,000
b. z = 2.5
c. p-value = .0062
Since the p-value = .0062 < .05, reject H0 . Therefore, it can be concluded that there has been a significant increase.

Answer to Question 2

a


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.

Did you know?

Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.

Did you know?

Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

Did you know?

Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

Did you know?

Many supplement containers do not even contain what their labels say. There are many documented reports of products containing much less, or more, that what is listed on their labels. They may also contain undisclosed prescription drugs and even contaminants.

The proportion of men and women with elevated blood pressure or taking hypertension medication incre The proportion of men and women with elevated blood pressure or taking hypertension medication incre
French and U.S. presidential elections in 2012 illustrate the durability of political culture and ho French and U.S. presidential elections in 2012 illustrate the durability of political culture and ho
Average national IQs according to IQ and Global Inequality Average national IQs according to IQ and Global Inequality
Proportion of Women and Men in the U.S. Labor Force Proportion of Women and Men in the U.S. Labor Force
The Gender Pay Gap Over Time: What Percentage of Men's Income Do Women Earn? The Gender Pay Gap Over Time: What Percentage of Men's Income Do Women Earn?
Health and Income per Capita: Two Views Health and Income per Capita: Two Views
Video: Bone Growth and Remodeling

For a complete list of videos, visit our video library