« previous next »

Author Question: A random sample of 87 airline pilots recruited by an airline service had an average yearly income of ... (Read 182 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?

In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

Did you know?

Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.

Did you know?

Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

Did you know?

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

Did you know?

It is difficult to obtain enough calcium without consuming milk or other dairy foods.

Average winter rainfall and variation in rainfall among sites inhabited by Suromalus ater Average winter rainfall and variation in rainfall among sites inhabited by Suromalus ater
Average optimal blood pressure for age Average optimal blood pressure for age
Sample Exercise Program for Healthy Older Adults Sample Exercise Program for Healthy Older Adults
Sources of income for U.S. population aged 65 and over. Sources of income for U.S. population aged 65 and over.
Sample prescriptions of drugs for oral fungal infections. Sample prescriptions of drugs for oral fungal infections.
How Health Interacts with Income How Health Interacts with Income
Video: Pneumonia Animation

For a complete list of videos, visit our video library