« previous next »

Author Question: In developing an interval estimate of the population mean, if the population standard deviation is ... (Read 120 times)

jasdeep_brar

  • Hero Member
  • *****
  • Posts: 569
on: Jun 24, 2018
In developing an interval estimate of the population mean, if the population standard deviation is unknown _____.
 a. it is impossible to develop an interval estimate
  b. a sample proportion can be used
  c. the sample standard deviation and t distribution can be used
  d. None of the answers is correct.

Question 2

The life expectancy of a particular brand of tire is normally distributed with a mean of 40,000 and a standard deviation of 5,000 miles. What is the probability that a randomly selected tire will have a life of at least 30,000 miles?
 a. .4772
  b. .9772
  c. .0228
  d. None of the answers is correct.


HandsomeMarc

  • Sr. Member
  • ****
  • Posts: 360
Reply #1 on: Jun 24, 2018
Answer to Question 1

c

Answer to Question 2

b


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Hip fractures are the most serious consequences of osteoporosis. The incidence of hip fractures increases with each decade among patients in their 60s to patients in their 90s for both women and men of all populations. Men and women older than 80 years of age show the highest incidence of hip fractures.

Did you know?

Never take aspirin without food because it is likely to irritate your stomach. Never give aspirin to children under age 12. Overdoses of aspirin have the potential to cause deafness.

Did you know?

There are more bacteria in your mouth than there are people in the world.

Did you know?

The average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.

Did you know?

When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

Ulnar Deviation Ulnar Deviation
Write the equation for the population y at any instant Write the equation for the population y at any instant
Some Cases of Population Aging Some Cases of Population Aging
A karyotype arranges the chromosomes in a standard format A karyotype arranges the chromosomes in a standard format
Which of the following is the most reasonable estimate of the number of characters (typed ... Which of the following is the most reasonable estimate of the number of characters (typed ...
Standard Electrode Potentials at 25 Degrees Standard Electrode Potentials at 25 Degrees
Video: Hip Animation

For a complete list of videos, visit our video library