Determine which case would you use to solve the following problem: A contractor

Question

Determine which case would you use to solve the following problem: A contractor claims that the joints spacing in a highway project have a standard deviation of 1.5 cm. An inspection of 12 joints at random yielded a sample standard deviation of 1.7 cm. Can it be said at the 5% level of significance that he delivered a project with a standard deviation greater than 1.5 cm?

(a) Case 1 of Confidence Intervals

(b) Case 2 of Confidence Intervals

(c) Case 3 of Confidence Intervals

(4) Case 4 of Confidence Intervals

(e) Case 1 of Hypothesis Tests, Question 3

(f) Case 4 of Hypothesis Tests, Question 3

Explanation / Answer

Determine which case would you use to solve the following problem: A contractor claims that the joints spacing in a highway project have a standard deviation of 1.5 cm. An inspection of 12 joints at random yielded a sample standard deviation of 1.7 cm. Can it be said at the 5% level of significance that he delivered a project with a standard deviation greater than 1.5 cm?

(f) Case 4 of Hypothesis Tests, Question 3

I will use a hypothesis test for Standard deviation!

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