# The principal selects the first 50 students who enter

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The principal selects the first 50 students who enter the building on a given day and administers the survey. Example 2: The town manager selects 10 homes in one neighborhood and sends an interviewer to the homes to determine household incomes. Example 3: An anti-gun advocacy group wants to estimate the percentage of people who favor stricter gun laws. They conduct a nation-wide survey of 1,203 randomly selected adults 18 years old and older. The interviewer asks the respondents, “Do you favor harsher penalties for individuals who sell guns illegally?” Example 4: Cold Stone Creamery is considering opening a new store in Marion. Before opening the store, the company would like to know the percentage of households in Marion that regularly visit an ice cream shop. The market researcher obtains a list of households in Marion and randomly selects 150 of them. He mails a questionnaire to the households that ask about their ice cream eating habits and favor preferences. Of the 150 questionnaires mailed, 14 are returned. Example 5: The owner of shopping mail wishes to expand the number of shops available in the food court. She have a market researcher survey mall customers during weekday mornings to determine what types of food the shoppers would like to see added to the food court. Example 6: The owner of radio station wants to know what their listeners think of the new format. He has the announcers invite the listeners to call in and voice their opinion. Homework: Day 2: pg 347-51 problems 5.15-17, 5.20, 5.22, 5.24, 5.28-30

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Chapter 5: Producing Data Section 5.2: Designing Experiments Knowledge Objectives: Students will: Define experimental units, subjects, and treatment . Define factor and level . Explain the major advantage of an experiment over an observational study . Explain the purpose of a control group . Explain the difference between control and a control group . List the three main principles of experimental design . Define a completely randomized design . Define a block . Construction Objectives: Students will be able to: Given a number of factors and the number of levels for each factor, determine the number of treatments . Give an example of the placebo effect . Discuss the purpose of replication, and give an example of replication in the design of an experiment. Discuss the purpose of randomization in the design of an experiment. Given a list of subjects, use a table of random numbers to assign individuals to treatment and control groups. Explain what it means to say that an observed effect is statistically significant . For an experiment, generate an outline of a completely randomized design. Give an example of a block design in an experiment. Explain how a block design may be better than a completely randomized design. Give an example of a
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The principal selects the first 50 students who enter the...

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