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11.1

11.1. Designing a study – Pg. 42. MAKE SURE TO BRING YOUR GRAPHING CALCULATOR TOMORROW & MONDAY. Vocabulary. Parameter: A measure that describes a characteristic of a population Statistic: A measure that describes a characteristic of a sample (i.e. mean, standard deviation)

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11.1

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  1. 11.1 Designing a study – Pg. 42 MAKE SURE TO BRING YOUR GRAPHING CALCULATORTOMORROW & MONDAY

  2. Vocabulary • Parameter: A measure that describes a characteristic of a population • Statistic: A measure that describes a characteristic of a sample (i.e. mean, standard deviation) • Bias: An error that results in a misrepresentation of members of a population • Random Sample: A Sample in which every member of the population has an equal chance of being selected.

  3. Example 1: Classify the study Determine whether the situation describes a survey, an experiment, or an observational study. Then identify the sample, and suggest a population from which it may have been selected. A. MOVIES A retro movie theater wants to determine what genre of movies to play during the next year. They plan to poll 50 random area residents and ask them what their favorite movies are. Survey B. DRIVING A driving school wants to determine the main issue drivers face while taking the driving test. They watch and record 30 random people taking the test. Observational Study C. A restaurant manager provides a new entrée to 30 randomly selected tasters and observes their reactions. Experiment

  4. Example 2: Choose a study type Determine whether the situation calls for a survey, an experiment, or an observational study. Explain your reasoning. A. VIDEO GAMES A gaming company plans to test whether a new controller is preferable to the old one. A group of teens will be observed while using the controllers, to see which one they use the most Experiment B. RESTAURANTS A restaurant wants to conduct an online study in which they will ask customers whether they were satisfied with their dining experience. Survey C. A research firm wants to test the effects of a new health drink. Determine whether the situation calls for a survey, an experiment, or an observational study. Explain your reasoning. Experiment

  5. Example 3: Determining Bias Determine whether the survey question is biased or unbiased. If biased, explain your reasoning. A. Do you think that poisons, such as pesticides, should be sprayed on crops? Biased – They use the word poison. B. Are you planning on watching the ultimate sporting event, the Super Bowl? Biased – They call it the “ultimate” sporting event. C. What is your favorite type of music? Unbiased

  6. Example 4: Identifying Flaws Identify any flaws in the design of the experiment, and describe how they could be corrected. A. Experiment: A research company wants to conduct a study to determine whether a new fishing reel is more effective than the old reel. The experimental procedure consists of using the new reel to catch fish in one lake, and using the old reel to catch fish in another nearby lake that is randomly chosen. Results: The company concludes that the new reel is twice as effective as the old reel. Flaw: Two different lakes

  7. Example 4: Identifying Flaws B. Experiment: A researcher wants to conduct a study to determine the effectiveness of new golf ball. They get 50 players with different playing abilities and compare their scores. They conclude that the new ball is more effective. Flaw: Different playing abilities

  8. Example 5: Design a Study PETS A research company wants to test a new food for overweight cats that promotes weight loss. State the objective of the experiment, suggest a population, determine the experimental and control groups, and describe a sample procedure. Objective: To determine whether overweight cats given a new weight loss food will lose the weight. Population: All overweight cats. Experimental group: A group of overweight cats given the food. Control group: A group of overweight cats given their regular food. Sample procedure: Weigh cats at the beginning, give each group the correct food and then weigh the cats again after a certain period of time.

  9. Example 6: DE-ICERS A research company wants to test a new de-icerfor frozen locks. Determine the experimental and control groups, and describe a sample procedure. A. experimental: a group where the new de-icer is used; control: a group where a different de-icer is used. The performances of the new de-icer and the control de-icer are then compared B. experimental: a group where a different de-icer is used; control: a group where the new de-icer is used. The performances of the new de-icer and the control de-icer are then compared. C. experimental: a group where the new de-icer is used; control: a group where a different de-icer is used. D. experimental: a group where a different de-icer is used; control: a group where the new de-icer is used.

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