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Intro-Stat, Math 203 A, Quiz 2
  1. State whether each boldface number in the passage below is a parameter or a statistic..
    A telemarketing company in Des Moines uses a machine that selects local phone numbers at random and dials them. Of the first 250 numbers dialed, 32% were unlisted. This is not surprising since 29% of all Des Moines phone numbers are unlisted.
       
       
       
       
       
  1. You are told that 68% of Central College students participate in athletics. A professor complains that they seem to get more than their share of students in class that must miss classtime due to athletics. You decide to simulate that professors class sizes and the number of athletes that the professor should have in each class.
    1. The first class has 12 students enrolled. Use the command randBin(12, 0.68) to simulate this situation. Give the result returned by your calculator, explain what it represents, and claculate the percentage of students in your simulated sample that participate in athletics.









    2. The other two courses taught by this professor have 32 students each. What randBin command would you use to simulate this situation?





  2. AcheAway Labs, a pharmaceutical company, has developed a new pain-relief medication for arthritis sufferers. Thirty patients in need of pain relief from arthritis are available. Each subject will be treated and asked one hour later, "About what percentage of pain relief did you experience?"
    1. Why should AcheAway not simply administer the new drug and record the patients' responses?

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    2. Draw an outline of an experiment to compare the drug's effectiveness with that of aspirin and a placebo. Use equal sized groups (10 each) for the experiment.

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    3. What does it mean to say that this experiment is double blind? What might go wrong if it were only single blind?

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    4. Pick a seed value (a whole number) and record it here:                . Now, seed your calculator with this value (enter your seed value and then press [STO>] rand [ENTER]), and use the randInt command to assign each patient (say patient 1 to 30) to each of the three groups (new drug, aspirin or placebo). Give an explanation of how you used your randInt command to accomplish this.