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Author Question: A machine dispenses a liquid drug into bottles in such a way that the standard deviation of the ... (Read 99 times)

Caiter2013

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on: Aug 1, 2018
A machine dispenses a liquid drug into bottles in such a way that the standard deviation of the contents is 81 milliliters.
 
  A new machine is tested on a sample of 24 containers and the standard deviation for this sample group is found to be 26 milliliters. At the 0.05 level of significance, test the claim that the amounts dispensed by the new machine have a smaller standard deviation.

Question 2

The library is to be given 5 books as a gift. The books will be selected from a list of 19 titles. If each book selected must have a different title, how many possible selections are there?
 
  A) 1.216451004e+17 B) 11,628 C) 1.01370917e+15 D) 1,395,360


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chloejackso

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Reply #1 on: Aug 1, 2018
Answer to Question 1

Test statistic: X2 = 2.370. Critical value: X2 = 13.091. Reject the null hypothesis. There is sufficient evidence to support the claim that the new machine produces a lower standard deviation.

Answer to Question 2

B


Caiter2013

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Reply #2 on: Aug 1, 2018
Both answers were spot on, thank you once again


chloejackso

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Reply #3 on: Aug 1, 2018
Great! Please up vote :D


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