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Author Question: For a standardized normal distribution, calculate P(1.78 < z < 2.34 ). A) 0.0124 B) 0.0341 ... (Read 55 times)

james0929

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on: Jun 24, 2018
For a standardized normal distribution, calculate P(1.78 < z < 2.34 ).
 
  A) 0.0124
  B) 0.0341
  C) 0.0412
  D) 0.0279

Question 2

A company in Maryland has developed a device that can be attached to car engines, which it believes will increase the miles per gallon that cars will get.
 
  The owners are interested in estimating the difference between mean mpg for cars using the device versus those that are not using the device. The following data represent the mpg for independent random samples of cars from each population. The variances are assumed equal and the populations normally distributed.With Device Without Device22.6 26.923.4 24.428.4 20.829.0 20.829.3 20.220.0 26.0 28.1 25.6Given this data, what is the critical value if the owners wish to have a 90 percent confidence interval estimate?A) t = 2.015
  B) t = 1.7823
  C) z = 1.645
  D) z = 1.96


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Cnarkel

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

D

Answer to Question 2

B


james0929

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Reply 2 on: Jun 24, 2018
Gracias!

bdobbins

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Reply 3 on: Yesterday
Excellent

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