FinalF11FormA - STAT 110 Fall 2011 Section 5 Your Exam...

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STAT 110 – Fall 2011 – Section 5 Your Exam Number is: You may use a non-programmable calculator. Please bring your ID up when you turn in the exam. Remember to bubble in your exam number (given above) in addition to your test form. If needed, recall that: Chebyshev’s inequality says that 1-1/ k 2 of the values are within k standard deviations from the mean; so, at least 75% of the observations are within 2 standard deviations from the mean and at least 88.9% are within 3. with z value Percent Confidence 1 68.3% 1.64 90% 1.96 95% 2.58 99% 3 99.7% 3.29 99.9% n p p p ) ˆ 1 ( ˆ value z ˆ - ±
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Your Exam Form is: A Questions 1-3 are based on the following description: USC athletics conducts a survey to find out what percent of all USC students would be in favor of having student tickets to football games cost $5.00 and require presentation of a student ID to use instead of increasing the current fee. Of the 500 students selected, 284 are in favor of charging for tickets and 216 are against it. 1) The population in this example is: A) All USC students. B) The 284 students in favor of charging for tickets. C) The 500 students asked. D) The percent of all USC students who favor charging for tickets. E) The percent of the 500 students asked who favor charging for tickets. 2) What is the percentage ( p ˆ ) of those surveyed who preferred charging for tickets. 1 = = 1 = 216 = 284 = 216 = 3) Instead of taking a simple random sample of all students, they could use a stratified sample by taking separate simple random samples from the under-classmen, upper-classmen, and graduate students. This would:
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