« previous next »

Author Question: A random sample of 87 airline pilots recruited by an airline service had an average yearly income of ... (Read 123 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?

The Food and Drug Administration has approved Risperdal, an adult antipsychotic drug, for the symptomatic treatment of irritability in children and adolescents with autism. The approval is the first for the use of a drug to treat behaviors associated with autism in children. These behaviors are included under the general heading of irritability and include aggression, deliberate self-injury, and temper tantrums.

Did you know?

Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

Did you know?

The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.

Did you know?

Russia has the highest death rate from cardiovascular disease followed by the Ukraine, Romania, Hungary, and Poland.

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.

Global Stratification: Income of the World's Nations Global Stratification: Income of the World's Nations
The Inverted Income Pyramid: The Proportion of Income Received by Each Fifth of the U.S. Population The Inverted Income Pyramid: The Proportion of Income Received by Each Fifth of the U.S. Population
Sample prescription for chlorhexidine. Sample prescription for chlorhexidine.
Sample prescriptions of drugs for oral fungal infections. Sample prescriptions of drugs for oral fungal infections.
Saving Rates by Income Quintile, 2003 Saving Rates by Income Quintile, 2003
A sample of work by a Grade 4 student with a specific learning disorder A sample of work by a Grade 4 student with a specific learning disorder
Video: Brain Anatomy Animation (Part 2 of 2)

For a complete list of videos, visit our video library