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Author Question: Ahmadi, Inc has been manufacturing small automobiles that have averaged 50 miles per gallon of ... (Read 85 times)

faduma

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on: Jun 24, 2018
Ahmadi, Inc has been manufacturing small automobiles that have averaged 50 miles per gallon of gasoline in highway driving. The company has developed a more efficient engine for its small cars and now advertises that its new small cars average more than 50 miles per gallon in highway driving. An independent testing service road-tested 64 of the automobiles. The sample showed an average of 51.5 miles per gallon with a standard deviation of 4 miles per gallon.
 a. Formulate the hypotheses to determine whether or not the manufacturer's advertising campaign is legitimate.
  b. Compute the test statistic.
  c. What is the p-value associated with the sample results and what is your conclusion? Let  = .05.

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 0.44 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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rosiehomeworddo

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

a. H0:   50
Ha:  > 50
b. t = 3
c. p-value (.0019) is less than .005; reject H0

Answer to Question 2

a. H0:  = 6
Ha:   6
b. t = 2
c. p-value (.0456) is between 0.02 and 0.05; therefore, reject H 0


faduma

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Reply 2 on: Jun 24, 2018
:D TYSM

peter

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Reply 3 on: Yesterday
Wow, this really help

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