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HW1 - STATISTICS 321 Homework Assignment 1 due Monday April...

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Unformatted text preview: STATISTICS 321 Homework Assignment 1 due Monday, April 6, 2009 1. In a large city school system with 20 elementary schools, the school board is considering the adoption of a new policy that would require elementary students to pass a test in order to be promoted to the next grade. The PTA wants to find out whether parents agree with this plan. Listed below are some of the ideas proposed for gathering data. For each, indicate what kind of sampling strategy is involved, and what (if any) kinds of problems might result. a. Randomly select one of the elementary schools and contact every parent by phone. b. Send a survey home with every student, and ask parents to fill it out and return it the next day. c. Randomly select 20 parents from each elementary school. Send them a survey, and follow up with a phone call if they don't return the survey within a week. d. Hold a PTA meeting at each of the 20 elementary schools and tally the opinions expressed by those who attend the meetings. e. Randomly select 100 parents from the district's enrollment records. 2. Explain whether a survey or an experiment would be most appropriate to find out about each of the following: a. Who is likely to win the next presidential election b. Whether the use of nicotine gum reduces cigarette smoking c. Whether there is a relationship between height and happiness for human adults d. Whether a public service advertising campaign has been effective in promoting the use of condoms e. Whether placing green plants in workers' offices will help reduce stress f. Whether eating just before going to bed causes nightmares 3. Refer to Exercise 2: Define the (most likely) populations for each of the situations (a) (f). 4. Classify the following attributes as either categorical, or numerical. For numerical variables, be sure to report the likely units in which the measurements were made: a. Number of students in a class of 35 who turn in a term paper before the due date. b. Gender of the next baby born at a particular hospital. c. Amount of fluid (in ounces) dispensed by a machine used to fill bottles with soda pop. d. Thickness of the gelatin coating of a vitamin E capsule. e. Birth order classification (only child, firstborn, middle child, lastborn) of a math major. 5. From the text: a. Section 1.2, Page 23: Exercises 1 to 5; 10 a, c; 14 a, b; 16 b. Section 1.3, Page 39: Exercises 7; 8 Suggested exercises from the text: Section 1.1: 1 to 7 ...
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