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

Author Question: The expected value of a discrete random variable _____. a. is the most likely or highest ... (Read 136 times)

londonang

  • Hero Member
  • *****
  • Posts: 540
on: Jun 24, 2018
The expected value of a discrete random variable _____.
 a. is the most likely or highest probability value for the random variable
  b. will always be one of the values x can take on, although it may not be the highest probability value for the random variable
  c. is the average value for the random variable over many repeats of the experiment
  d. All of the answers are correct.

Question 2

A lathe is set to cut bars of steel into lengths of 6 centimeters. The lathe is considered to be in perfect adjustment if the average length of the bars it cuts is 6 centimeters. A sample of 121 bars is selected randomly and measured. It is determined that the average length of the bars in the sample is 6.08 centimeters with a standard deviation of .44 centimeters.
 a. Formulate the hypotheses to determine whether or not the lathe is in perfect adjustment.
  b. Compute the test statistic.
  c. Using the p-value approach, what is your conclusion? Let  = .05.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

maaaaaaaaaa

  • Sr. Member
  • ****
  • Posts: 336
Reply #1 on: Jun 24, 2018
Answer to Question 1

c

Answer to Question 2

a. H0:  = 6 centimeters
Ha:   6 centimeters
b. t = 2
c. p-value (.0456) is between .02 and .05; therefore, reject H0 . The lathe is not in perfect adjustment.


londonang

  • Member
  • Posts: 540
Reply 2 on: Jun 24, 2018
Great answer, keep it coming :)

momolu

  • Member
  • Posts: 320
Reply 3 on: Yesterday
Excellent

« previous next »
 

Did you know?

The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.

Did you know?

Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

Did you know?

The tallest man ever known was Robert Wadlow, an American, who reached the height of 8 feet 11 inches. He died at age 26 years from an infection caused by the immense weight of his body (491 pounds) and the stress on his leg bones and muscles.

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?

Alcohol acts as a diuretic. Eight ounces of water is needed to metabolize just 1 ounce of alcohol.

A plot of trophic diversity across the major groups of organisms shows highest trophic diversity amo A plot of trophic diversity across the major groups of organisms shows highest trophic diversity amo
Betelgeuse is a semiregular variable star Betelgeuse is a semiregular variable star
Rates of Childhood Overweight and Obesity Worldwide The highest rates occur in the most affluent re Rates of Childhood Overweight and Obesity Worldwide The highest rates occur in the most affluent re
Negative feedback control of a regulated variable. Negative feedback control of a regulated variable.
For centuries, widows in the Mediterranean countries, such as thise widow in Greece, were expected ... For centuries, widows in the Mediterranean countries, such as thise widow in Greece, were expected ...
The distribution of the number of hours that a random sample of people spend doing chores per ... The distribution of the number of hours that a random sample of people spend doing chores per ...
Video: Neuron Structure Animation

For a complete list of videos, visit our video library