Ch 1 Worksheet -3

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California State University, Sacramento *

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20

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Chemistry

Date

Feb 20, 2024

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docx

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2

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Ch 1 Worksheet EXAMPLE 1: Populations and Samples During the 2020-2021 school year, 2800 kids and teens at 20 randomly selected middle and high schools in the Kansas City area completed a survey on food and weight-related behaviors, including activities tied to muscle gain. In addition to steroid use, more than one-third of boys and one-fifth of girls in the study said they had used protein powder or shakes to gain muscle mass, and between five and 10 percent used non-steroid muscle- enhancing substances. 1. What is the population represented in this survey? What is the sample? 2. Is the finding that 1/3 of boys using protein power or shakes to gain muscle mass a parameter or a statistic? EXAMPLE 2: Statistical Significance versus Practical Significance In a study of an exercise program, 40 subjects lost an average of 10 pounds over six months. There is about a 1% chance of getting such results with a program that has no effect. Determine whether the results appear to have statistical significance, and also determine whether the results appear to have practical significance. EXAMPLE 3: Consider the Source A candy bar manufacturer conducted a study that found that individuals that consumed chocolate bars at least once a day had fewer headaches than those who did not consume chocolate bars. Determine whether the given source has the potential to create bias.
EXAMPLE 4: TRUE or FALSE: Very large samples guarantee sound statistical results. Defend your answer with a brief explanation.
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