Exam 1-DSCI 3710-Spring 2015 Version A

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

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COURSE: DSCI 3710 Print Name: Exam 1 Version A Signature: Spring 2015 Student ID#: INSTRUCTIONS: Please print your name and student ID number on this exam. Also, put your signature on this exam. On your scantron PRINT your name and exam version. This exam has 25 questions . You have 75 minutes to complete this exam. The exam is open book and open notes. You may use a laptop computer or any type of hand calculator but please show all your work on the exam and mark all answers on the scantron. Usage of cell phones, digital cameras and other communication devices is prohibited. Please DO NOT pull this exam apart. When you have completed the exam, please turn your scantron and exam booklet into your instructor, at the front desk. Good luck and we wish you well on the exam. Note: Whenever question(s) are connected you may be asked to assume a result (given a value) as an answer for the previous question but this result (value) may or may not be correct. The procedure is set in place to prevent you from losing points on a subsequent question because you made a mistake on some previous question/s.
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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?
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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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