Stats 200

 

Please give compete work for each

1. (4 points) Imagine a researcher wanted to test the effect of the new drug on reducing blood pressure. In this study, there were 50 participants. The researcher measured the participants’ blood pressure before and after the drug intake. If we want to compare the mean blood pressure from the two time periods with a two-tailed t test, how many degrees of freedom are there?

           A. 49

           B. 60

           C. 99

           D. 50

 

 

 

 

2. (4 points) A researcher claims that the amount of acetaminophen in a certain brand of cold tablets have a standard deviation different from the σ = 2.5 mg claimed by the manufacturer. Assuming that a hypothesis test of the claim has been conducted and that the conclusion is failure to reject the null hypothesis, state the conclusions in nontechnical terms.

A.    There is not sufficient evidence to support the claim that the standard deviation is different from 2.5 mg.

B.     There is sufficient evidence to support the claim that the standard deviation is different from 2.5 mg.

C.     There is sufficient evidence to support the claim that the standard deviation is equal to 2.5 mg.

D.    There is not sufficient evidence to support the claim that the standard deviation is equal to 2.5 mg.

 

 

 

SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.  Express percents as decimals. Round dollar amounts to the nearest cent.

9. A manufacturer considers his production process to be out of control when defects exceed 3%. In a random sample of 85 items, the defect rate is 5.9% but the manager claims that this is only a sample fluctuation and production is not really out of control. At the 0.01 level of significance, test the manager’s claim.

a. (3 points) Identify the null hypothesis and alternative hypothesis.

 

 

b. (3 points) Find the test statistic.

 

 

c. (3 points) Fin the p-value.

 

 

d. (3 points) Draw conclusion about the null hypothesis.

 

 

 

e. (3 points) Draw the final nontechnical conclusion that addresses the original claim.

 

 

 

 

10. (9 points) The claim is that the proportion of accidental deaths of the elderly attributable to residential falls is more than 0.15, and the sample statistics include n=900 deaths of the elderly with 20% of them attributable to residential falls. Find the value of the test statistic z using the following formula,

 

 

AccountingQueen

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Status NEW Posted 13 Aug 2017 05:08 PM My Price 8.00

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