This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: The average weekly earnings of bus drivers in a city are 950 (that is ) with a standard deviation of ... (Read 397 times)

KWilfred

  • Hero Member
  • *****
  • Posts: 570
on: Jun 24, 2018
The average weekly earnings of bus drivers in a city are 950 (that is ) with a standard deviation of 45 (that is ). Assume that we select a random sample of 81 bus drivers.
 a. Assume the number of bus drivers in the city is large compared to the sample size. Compute the standard error of the mean.
 b. What is the probability that the sample mean will be greater than 960?
  c. If the population of bus drivers consisted of 400 drivers, what would be the standard error of the mean?

Question 2

Which of the following is NOT a characteristic of the normal probability distribution?
 a. The graph of the curve is the shape of a rectangle.
  b. The total area under the curve is always equal to 1.
  c. The random variable assumes a value within plus or minus three standard deviations of its mean 99.72 of the time.
  d. The mean is equal to the median, which is also equal to the mode.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

hugthug12

  • Sr. Member
  • ****
  • Posts: 329
Reply #1 on: Jun 24, 2018
Answer to Question 1

a. 5
b. .0228
c. 4.47

Answer to Question 2

a


KWilfred

  • Member
  • Posts: 570
Reply 2 on: Jun 24, 2018
Excellent

aliotak

  • Member
  • Posts: 326
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

The U.S. Pharmacopeia Medication Errors Reporting Program states that approximately 50% of all medication errors involve insulin.

Did you know?

Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

Did you know?

When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).

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?

This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

Mars's average distance from the Sun is roughly 230 million km (1.5 AU) and its orbital period Mars's average distance from the Sun is roughly 230 million km (1.5 AU) and its orbital period
Charting Progress: Weekly Exercise Training Log Charting Progress: Weekly Exercise Training Log
Standard Alcoholic Drink Sizes Standard Alcoholic Drink Sizes
How to fully analyze the standard and factored form of a quadratic equation (Question 1) How to fully analyze the standard and factored form of a quadratic equation (Question 1)
The average weight gain between Thanksgiving and New Year's Day is about a pound The average weight gain between Thanksgiving and New Year's Day is about a pound
Average quarterly presidential approval rating, from Eisenhower to Trump Average quarterly presidential approval rating, from Eisenhower to Trump
Video: Nucleic acid digestion -small intestine

For a complete list of videos, visit our video library