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Author Question: The expected value of a discrete random variable _____. a. is the most likely or highest ... (Read 126 times)

londonang

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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.


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maaaaaaaaaa

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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

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Reply 2 on: Jun 24, 2018
YES! Correct, THANKS for helping me on my review

amcvicar

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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