Exam 1-DSCI 3710-Spring 2015 Version A

# Exam 1-DSCI 3710-Spring 2015 Version A - COURSE DSCI 3710...

• Test Prep
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Use the information given in the following paragraph to answer the first four questions. 260 people are randomly chosen at a shopping mall to taste-test a new brand of fruit drink. They are asked to rate the drink on a scale from 1 to 7, with 1 being very bad and 7 being very good. The results of the survey reveal that the average rating is 5.22 with a standard deviation of 2.31. The marketing division of the fruit drink distributor is only interested in selling this drink if the true mean rating is more than 4.75. 1. What is the alternative hypothesis for testing whether the fruit drink distributor should sell this drink? A. H a : µ ≠ 4.75 B. H a : µ = 2.25 C. H a : µ > 4.75 D. H a : µ < 4.75 E. H a : µ > 2.25 2. What is the calculated value of the test statistic? 3. What is the rejection region for testing at the 0.10 level of significance whether the fruit drink distributor should sell this drink? 4. Assuming the calculated value of the test statistic is 1.78 , what is the conclusion of testing at the .10 level of significance whether the fruit drink distributor should sell this drink?
Use the information given in the next paragraph to answer the next four questions .

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• Spring '08
• Dr.Jay
• Statistical hypothesis testing, B. Reject Ho, Mean test scores

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