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From a population that is normally distributed, a sample of 25 elements is selected and the standard deviation of the sample is computed. For the interval estimation of µ, the proper distribution to use is the

Part I Multiple Choice Questions: (Choose the best answer to complete the question or the statement.) (4 Points each, 60 points total.)

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

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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.