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April 21, 2014

April 21, 2014

Posted by **Nicole** on Sunday, April 15, 2012 at 6:03pm.

The following questions pertaining to the data above I need answered are:

Identify the design of the study.

A. paired t-test of a mean

B. two-sample t-test of means

C. either test will work

Suppose that you want to perform a hypothesis test to determine whether, on average, EES reduces CO emissions.

What null hypothesis would you use to test if the MAGNETIZER reduces emissions?

A. H0: μ (before MAGENTIZER) = μ (after MAGNETIZER)

B. H0: μ (before MAGENTIZER) ≠ μ (after MAGNETIZER)

C. H0: μ d = 0 where μ d = μ (before MAGENTIZER) - μ (after MAGNETIZER)

D. H0: μ d ≠ 0 where μ d = μ (before MAGENTIZER) - μ (after MAGNETIZER)

Suppose that you want to perform a hypothesis test to determine whether, on average, EES reduces CO emissions.

What alternative hypothesis would you use to test if the MAGNETIZER reduces emissions?

A. HA: μ (before MAGENTIZER) = μ (after MAGNETIZER)

B. HA: μ (before MAGENTIZER) > μ (after MAGNETIZER)

C. HA: μ d > 0 where μ d = μ (before MAGENTIZER) - μ (after MAGNETIZER)

D. HA: μ d ≠ 0 where μ d = μ (before MAGENTIZER) - μ (after MAGNETIZER)

E. HA: μ d < 0 where μ d = μ (before MAGENTIZER) - μ (after MAGNETIZER)

Using the data provided, conduct the hypothesis test. What p-value do you obtain?

A. 0.0062

B. 0.0039

C. 0.9961

D. 0.0148

Using the p-value you obtained in the previous question and assuming that you are testing at the 0.01 significance level, what is your conclusion?

A. Reject HO: The MAGNETIZER appears to reduce emissions

B. Reject HO: The MAGNETIZER does not appear to reduce emissions

C. Do not reject HO: The MAGNETIZER appears to reduce emissions

D. Do not reject HO: The MAGNETIZER does not appear to reduce emissions

What is the lower bound for the 99% confidence interval for the change in emissions following the installation of the MAGENTIZER system (before - after)? Show two decimal places in your answer

What is the upper bound for the 99% confidence interval for the change in emissions following the installation of the MAGENTIZER system (before - after)? Show two decimal places in your answer

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