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Author Question: Assume z is a standard normal random variable. Compute the following probabilities. a. P(1.33 z ... (Read 50 times)

CharlieWard

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on: Jun 24, 2018
Assume z is a standard normal random variable. Compute the following probabilities.
 a. P(1.33  z  1.67)
  b. P(1.23  z  1.55)
  c. P(z  2.32)
  d. P(z  2.08)
  e. P(z  1.08)

Question 2

In order to estimate the average electric usage per month, a sample of 196 houses was selected and the electric usage determined.
 a. Assume a population standard deviation of 350 kilowatt-hours. Determine the standard error of the mean.
  b. With a .95 probability, determine the margin of error.
  c. If the sample mean is 2,000 KWH, what is the 95 confidence interval estimate of the population mean?


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smrerig

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Reply #1 on: Jun 24, 2018
Answer to Question 1

a. .8607
b. .0487
c. .0102
d. .9812
e. .8599

Answer to Question 2

a. 25
b. 49
c. 1951 to 2049


CharlieWard

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Reply 2 on: Jun 24, 2018
Gracias!

frankwu0507

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Reply 3 on: Yesterday
Wow, this really help

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