Problem

Test the given claim. Assume that a simple random sample is selected from a normally distributed population. Use either the P-value method or the traditional method of testing hypotheses.
Company A uses a new production method to manufacture aircraft altimeters. A simple random sample of new altimeters resulted in errors listed below. Use a 0.05 level of significance to test the claim that the new production method has errors with a standard deviation greater than 32.2ft, which was the standard deviation for the old production method. If it appears that the standard deviation is greater, does the new production method appear to be better or worse than the old method? Should the company take any action?
44,78,25,75,44,14,17,52,9,50,108,108 ㅁ․ 
What are the null and alternative hypotheses?
A. H0:σ=32.2ft H1:σ>32.2ft
B.
H0:σ=32.2ftH1:σ32.2ft
C. H0:σ32.2ft
D. H1:σ=32.2ft
H0:σ>32.2ftH1:σ=32.2ft
E.
H0:σ<32.2ftH1:σ=32.2ft
F.
H0:σ=32.2ftH1:σ<32.2ft

Answer

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Answer

Final Answer: A

Steps

Step 1 :The null hypothesis is usually a statement of no effect or no difference. In this case, the null hypothesis would be that the standard deviation of the new production method is equal to the standard deviation of the old production method, which is 32.2ft.

Step 2 :The alternative hypothesis is what we are testing for. In this case, we are testing if the standard deviation of the new production method is greater than 32.2ft.

Step 3 :Therefore, the null and alternative hypotheses are: H0:σ=32.2ft and H1:σ>32.2ft

Step 4 :So, the answer is A.

Step 5 :Final Answer: A

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