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Gsk - Spss Analysis

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Now you have some basic understanding of SPSS, it is time to explore the program is more detail by doing some exercises. If you use the computer, all you need to know are the right commands. Since the questions below involve inferences about population means, the number of commands you will use is rather limited (Analyze > Compare Means). The real challenge of these questions is therefore not so much in the statistics involved (which mainly pertain to Chapters 12 and 13), but to be able to define the problem, identify which statistical method is most appropriate, and to interpret the results.

1) Suppose that, in a large state university (with numerous campuses), the marks in an introductory statistics course are normally distributed with a mean of 68. To determine the effect of requiring students to pass a calculus test (which at present is not a prerequisite), a random sample of 50 students who have taken calculus is given a statistics course. The marks out of 100 were recorded.

a. Estimate with 95% confidence the mean statistics mark for all students that have taken calculus. b. Do these data provide evidence to infer that students with a calculus background would perform better in statistics than students with no calculus.

2) The owner of a downtown parking lot suspects that the person he hired to run the lot is stealing some money. The receipts as provided by the employee indicate that the average number of cars parked in the lot is 125 per day and that, on average, each car is parked for 3.5 hours. To determine whether the employee is stealing, the owner watches the lot for 5 days. On those days, the numbers of cars parked are as follows: 120, 130, 124, 127, 128. The time spent on the lot for the 629 cars that the owner observed during the five days was recorded. Can the owner conclude at the 1% level of significance that the employee is

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