« previous next »

Author Question: A random sample of 87 airline pilots recruited by an airline service had an average yearly income of ... (Read 151 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?

Critical care patients are twice as likely to receive the wrong medication. Of these errors, 20% are life-threatening, and 42% require additional life-sustaining treatments.

Did you know?

The largest baby ever born weighed more than 23 pounds but died just 11 hours after his birth in 1879. The largest surviving baby was born in October 2009 in Sumatra, Indonesia, and weighed an astounding 19.2 pounds at birth.

Did you know?

Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

Did you know?

Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.

Did you know?

Human kidneys will clean about 1 million gallons of blood in an average lifetime.

Bell Curve for Intelligence IQ scores for a population-based sample usually fall into this kind of Bell Curve for Intelligence IQ scores for a population-based sample usually fall into this kind of
Sample Exercise Prescription for Weight Training: Advanced Sample Exercise Prescription for Weight Training: Advanced
Sample Medicare identification card. Sample Medicare identification card.
Gas molecules have no bonds to other molecules and move in random motion. Gas molecules have no bonds to other molecules and move in random motion.
Determination of Income Inequality Determination of Income Inequality
Saving Rate by Decile of Income per Capita Saving Rate by Decile of Income per Capita
Video: Endocytosis - pinocytosis, receptor mediated and Transcytosis

For a complete list of videos, visit our video library