« previous next »

Author Question: A random sample of 87 airline pilots recruited by an airline service had an average yearly income of ... (Read 228 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 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

Did you know?

It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

Did you know?

After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

Did you know?

Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

Did you know?

Aspirin may benefit 11 different cancers, including those of the colon, pancreas, lungs, prostate, breasts, and leukemia.

Average Global Temperature Rise over the Past Century Average Global Temperature Rise over the Past Century
After checking for stored diagnostic trouble codes (DTCs), the wise technician checks service ... After checking for stored diagnostic trouble codes (DTCs), the wise technician checks service ...
How long does it take for 90% of a sample of strontium-90 (half-life of 28.8 years) to decay? How long does it take for 90% of a sample of strontium-90 (half-life of 28.8 years) to decay?
Sample prescriptions of drugs for oral herpes infection. Sample prescriptions of drugs for oral herpes infection.
Sample One-Day Menu Sample One-Day Menu
Income per Capita versus Total Fertility Rate Income per Capita versus Total Fertility Rate
Video: Inflammatory response Animation

For a complete list of videos, visit our video library