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 96 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?

Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.

Did you know?

Persons who overdose with cardiac glycosides have a better chance of overall survival if they can survive the first 24 hours after the overdose.

Did you know?

A recent study has found that following a diet rich in berries may slow down the aging process of the brain. This diet apparently helps to keep dopamine levels much higher than are seen in normal individuals who do not eat berries as a regular part of their diet as they enter their later years.

Did you know?

The top 10 most important tips that will help you grow old gracefully include (1) quit smoking, (2) keep your weight down, (3) take supplements, (4) skip a meal each day or fast 1 day per week, (5) get a pet, (6) get medical help for chronic pain, (7) walk regularly, (8) reduce arguments, (9) put live plants in your living space, and (10) do some weight training.

Did you know?

Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.

Sceloporus undulates, the eastern fence lizard, is one of the most widely distributed lizard species Sceloporus undulates, the eastern fence lizard, is one of the most widely distributed lizard species
First-pass effect: (a) drugs are absorbed; (b) drugs enter hepatic portal circulation and go directl First-pass effect: (a) drugs are absorbed; (b) drugs enter hepatic portal circulation and go directl
Connecting cables and a computer to perform off-board programming. Connecting cables and a computer to perform off-board programming.
How to create a table of values displaying commission and earnings (Question 2) How to create a table of values displaying commission and earnings (Question 2)
Computer Models Computer Models
GO! All in One: Computer Concepts and Applications, 3rd GO! All in One: Computer Concepts and Applications, 3rd
Video: Phases of an Action Potential - Resting Potential, Threshold, Rising, Falling, & Recovery Phases

For a complete list of videos, visit our video library