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Quiz 8.2
Chapter 8 - Day 6
Students Struggled With…
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Solving for a sample size for a desired margin of error. Really the hardest part is doing the algebra, especially because when you square a decimal, it gets really, really small. Students tend to round which changes their final answer substantially.
Remedies…
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Practice, practice, practice! A helpful trick when solving is to split the square root up in the numerator and denominator. Then multiply by √n to get n out of the denominator. Don’t square until the final step! This should help students to get more accurate final answers.
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