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QBA II sample exam 1 with answers

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QUANTITATIVE BUSINESS ANALYSIS II 6500:222 Sample exam 1 Professor Patankar Name :___________________________ Instructions : 1. Solve all problems b. Show all work for full credit 3. Point allocation is indicated in the parentheses. 4. Answers without supporting justification will not receive credit 5. Calculators are permitted. 6. Return the exam and scantron to your instructor when you are finished and before leaving the room 7. Please turn off your cell phones. 8. Please remove your caps.

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(6) 1. . On one of the islands the hotel chain had facilities at two different locations. In tabulating the responses to the single question “Are you likely to choose this hotel again?” 163 out of 227 guests at the Beachcomber responded yes, whereas at the Windsurfer 154 out of 262 guests responded yes. At the α = 0.05 level of significance, is there an evidence of a significant difference in guest satisfaction (as measured by likelihood of return to the hotel) between the two hotels? 2
(6) 2. Four secretaries were selected at random from among secretaries of a large insurance company. The typing speed (words per minute) was recorded for each secretary on an electric typewriter and on a computer keyboard. Secretary Electric Computer Typewriter Keyboard 1 74 88 2 69 77 3 75 79 4 64 70 Do the data justify the conclusion that the secretaries' typing speeds are greater with a computer keyboard than with an electric typewriter? Use α = 0.05. State the hypotheses and explain your conclusions. 3

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(5) 3 . Maxforce, Inc., manufactures racquetball racquets by two different manufacturing processes (A and B). Because the management of this company is interested in estimating the difference between the average times it takes each process to produce a racquet, they select independent samples from each process.
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