sp98ex1c

# sp98ex1c - COURSE MSCI 3710 EXAM 1 Version C SEMESTER...

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COURSE: MSCI 3710 Print Name: EXAM 1 Signature: Version C S.S.#: SEMESTER: Spring 1998 Seat Number: Note: Whenever question(s) are connected you may be asked to assume a result (given a value) from the previous question but this result may or may not be correct. This is to prevent you from losing points on a second question because you made a mistake on a previous question.

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Use the information below to answer the next three questions The director of research and development for a large drug firm is overseeing the testing of a new medicine. She wants to know if there is evidence at the 0.02 level that the medicine relieves pain for more than 6.1 hours. After sampling 130 patients, the medicine has been found to relieve pain an average of 6.3 hours with standard deviation of 1.5 hours. 1. What is the null hypothesis and alternative hypothesis for this test? A. Ho: µ≤ 6.3 Ha: µ > 6.3 B. Ho: µ≥ 6.1 Ha: µ< 6.1 C. Ho: µ≥6.3 Ha: µ <6.3 D. Ho: µ≤ 6.1 Ha: µ > 6.1 E. Ho: µ≤ 6.1 Ha: µ = 6.1 2. What is the calculated value of the test statistic. A. Z* = 1.52 B. Z* = 1.96 C. Z* = 2.63 D. Z* = -1.22 E. Z* = - 0.89 3. What are the decision and conclusion of the test, assuming the calculated value of the test statistic is 1.52? A. Fail to reject the null hypothesis, conclude there is insufficient evidence the medicine relieves pain for more than 6.1 hours on average. B. Reject the null hypothesis, conclude there is evidence the medicine relieves pain for more than 6.1 hours on average. C. Fail to reject the null hypothesis, conclude there is evidence the medicine relieves pain for more than 6.1 hours on average. D. Reject the null hypothesis, conclude there is insufficient evidence the medicine relieves pain for more than 6.1 hours on average. E. Fail to reject the null hypothesis, conclude there is overwhelming evidence the medicine does not relieve pain for more than 6.1 hours on average.
The next two questions are connected Our environment is sensitive to the amounts of ozone in the upper atmosphere. The level of ozone normally found is 7.6 parts/million(ppm). A researcher believes the current ozone level is above this norm. The mean and standard deviation of a random sample of 10 observations are 7.7 ppm and 1.1 ppm respectively. Do the data support the claim at the 0.1 significance level? 4. What is the calculated value of the test statistic? A. t* = 5.661 B. t* = 0.225 C. t* = -0.025 D. t* = -2.330 E. t* = 0.287 5. What is the decision rule for this test? A.

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## This note was uploaded on 03/09/2011 for the course DSCI 3710 taught by Professor Dr.jay during the Spring '08 term at North Texas.

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sp98ex1c - COURSE MSCI 3710 EXAM 1 Version C SEMESTER...

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