« previous next »

Author Question: A random sample of 87 airline pilots recruited by an airline service had an average yearly income of ... (Read 152 times)

laurencescou

  • Hero Member
  • *****
  • Posts: 593
on: Jun 24, 2018
A random sample of 87 airline pilots recruited by an airline service had an average yearly income of 99,400 with a standard deviation of 12,000.
 a. If we want to determine a 95 confidence interval for the average yearly income of the population, what is the value of t?
  b. Develop a 95 confidence interval for the average yearly income of all pilots.

Question 2

In practice, it is common to use the sample ________ to estimate the process _________.
 a. variances, range
 b. means, variance
 c. standard deviations, mean
  d. ranges, standard deviation


johnharpe

  • Sr. Member
  • ****
  • Posts: 338
Reply #1 on: Jun 24, 2018
Answer to Question 1

a. 1.988
b. 96,842.37 to 101,957.63

Answer to Question 2

d


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

There are immediate benefits of chiropractic adjustments that are visible via magnetic resonance imaging (MRI). It shows that spinal manipulation therapy is effective in decreasing pain and increasing the gaps between the vertebrae, reducing pressure that leads to pain.

Did you know?

Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.

Did you know?

Your heart beats over 36 million times a year.

Did you know?

Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.

Did you know?

Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.

On average, the ratio of carbon to nitrogen is much higher in terrestrial plants than in other major On average, the ratio of carbon to nitrogen is much higher in terrestrial plants than in other major
Mark Twain supplemented his income as a writer by giving humorous lectures. Mark Twain supplemented his income as a writer by giving humorous lectures.
William Morris, Page from a specimen book with sample proof letters, Kelmscott Press. William Morris, Page from a specimen book with sample proof letters, Kelmscott Press.
Women who are 65 and older have a lower median income from all sources than men in the same age ... Women who are 65 and older have a lower median income from all sources than men in the same age ...
An archaeological sample contains 0.700 g of lead-206 and 2.144 g of uranium-238. Assume that ... An archaeological sample contains 0.700 g of lead-206 and 2.144 g of uranium-238. Assume that ...
Random X inactivation in female placental mammals Random X inactivation in female placental mammals
Video: Virtual Tour of the Eye Animation

For a complete list of videos, visit our video library