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For the following observations, a scatter diagram is plotted. What kind of relationship (if any) does it exist between x and y?  

Please read and confirm the Honor Pledge stated below.   Consistent with Indiana University’s Code of Student Rights, Responsibilities, & Conduct, I agree that my answers to this exam represent my work and my work only. I also understand that all forms of academic misconduct are prohibited including, but is not limited to, all forms of cheating, fabrication, plagiarism, or the use of unauthorized materials.

Choose the correct statement about the following histogram.

Essay Question:  4(b). Use the empirical rule to state the percentage of annual sales between 1255 and 9181 (millions of dollars). 

Essay Question:  6(a). What is the probability that the sample contains exactly 3 students who live in the dormitories? 

Essay Question: 2(d). What is the probability that the customer is single given that she is female? 

Essay Question: 1.d. Please indicate categorical or quantitative variables of each of the following three variables: Sales per employee is [variable1]; Sales rank is [variable2]; Number of employees is [variable3].

Essay Question: 2(e). Assume the event F is that a randomly selected customer is female and the event S is that a randomly selected customer is single. Are events F and S independent events? Use probability information to justify your answer. 

Exhibit 1 Michael’s Compute-All, a national computer retailer, has kept a record of the number of laptop computers they have sold for a period of 80 days. Their sales records are shown below: Number of Laptops Sold Number of Days 0 – 19 5 20 – 39 15 40 – 59 30 60 – 79 20 80 – 99 10 Total 80  

Part II: Problems (Answers are graded on the reasoning used to arrive at an answer, not simply on the answer. Thus, show the reasons and calculation process! If your answer is not an integer, round off results at 4 decimal places.) (89 points total)