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

Author Question: The monthly earnings of computer programmers are normally distributed with a mean of 4,000 . If only ... (Read 94 times)

audragclark

  • Hero Member
  • *****
  • Posts: 579
on: Jun 24, 2018
The monthly earnings of computer programmers are normally distributed with a mean of 4,000 . If only 1.7 of programmers have monthly incomes of less than 2,834, what is the standard deviation of the monthly earnings of the computer programmers?

Question 2

The makers of a soft drink want to identify the average age of its consumers. A sample of 16 consumers is selected. The average age in the sample was 22.5 years with a standard deviation of 5 years. Assume the population of consumer ages is normally distributed.
 a. Construct a 95 confidence interval for the average age of all the consumers.
  b. Construct an 80 confidence interval for the average age of all the consumers.
  c. Discuss why the 95 and 80 confidence intervals are different.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

raili21

  • Sr. Member
  • ****
  • Posts: 324
Reply #1 on: Jun 24, 2018
Answer to Question 1

550

Answer to Question 2

a. 19.836 to 25.164
b. 20.824 to 24.176
c. As the level of confidence increases, the confidence interval gets wider.


audragclark

  • Hero Member
  • *****
  • Posts: 579
Reply #2 on: Jun 24, 2018
Thank you :)


raili21

  • Sr. Member
  • ****
  • Posts: 324
Reply #3 on: Jun 24, 2018
Happy to help you


« previous next »
 

Did you know?

It is difficult to obtain enough calcium without consuming milk or other dairy foods.

Did you know?

Anesthesia awareness is a potentially disturbing adverse effect wherein patients who have been paralyzed with muscle relaxants may awaken. They may be aware of their surroundings but unable to communicate or move. Neurologic monitoring equipment that helps to more closely check the patient's anesthesia stages is now available to avoid the occurrence of anesthesia awareness.

Did you know?

The tallest man ever known was Robert Wadlow, an American, who reached the height of 8 feet 11 inches. He died at age 26 years from an infection caused by the immense weight of his body (491 pounds) and the stress on his leg bones and muscles.

Did you know?

The familiar sounds of your heart are made by the heart's valves as they open and close.

Did you know?

In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.

Frequently Used Computer Terms Frequently Used Computer Terms
A replaceable PROM used in an older General Motors computer. Notice that the sealed access panel ... A replaceable PROM used in an older General Motors computer. Notice that the sealed access panel ...
Many electronic components are used to construct a typical vehicle computer. Notice the quantity of ... Many electronic components are used to construct a typical vehicle computer. Notice the quantity of ...
Jump Right In: Essential Computer Skills Using Microsoft Office 2013 (2nd Edition) Jump Right In: Essential Computer Skills Using Microsoft Office 2013 (2nd Edition)
GO! All in One: Computer Concepts and Applications, 3rd GO! All in One: Computer Concepts and Applications, 3rd
Students working around a computer Students working around a computer
Video: Epinephrine/NE (heart rate, altered blood flow, glycogenolysis & bronchodilation)

For a complete list of videos, visit our video library