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 60 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?

Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.

Did you know?

For pediatric patients, intravenous fluids are the most commonly cited products involved in medication errors that are reported to the USP.

Did you know?

People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.

Did you know?

After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.

Did you know?

If you use artificial sweeteners, such as cyclamates, your eyes may be more sensitive to light. Other factors that will make your eyes more sensitive to light include use of antibiotics, oral contraceptives, hypertension medications, diuretics, and antidiabetic medications.

Good computer skills are now required to be a successful member of an office staff. Good computer skills are now required to be a successful member of an office staff.
Overview of a computer-controlled high-pressure common rail V-8 diesel engine. Overview of a computer-controlled high-pressure common rail V-8 diesel engine.
How to calculate monthly payments at varying amortization periods (Question 2) How to calculate monthly payments at varying amortization periods (Question 2)
Go! All in One: Computer Concepts and Applications (2nd Edition) Go! All in One: Computer Concepts and Applications (2nd Edition)
Computer Literacy for IC3, Unit 2: Using Productivity Software, Update to Office 2013 & Windows ... Computer Literacy for IC3, Unit 2: Using Productivity Software, Update to Office 2013 & Windows ...
Calculate the accumulated value of monthly payments of $100.00 made at the end of each month ... Calculate the accumulated value of monthly payments of $100.00 made at the end of each month ...
Video: Genetic distance between human groups

For a complete list of videos, visit our video library