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Quiz 10.2 and 10.3
Day 110
Students Struggled With…
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Using the correct t* critical value when calculating a t interval.
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Deciding between μ1- μ2 and μdiff.
Remedies…
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Require students write the specific formula for a t interval. This extra step may remind them that they need a t* instead of a z* which was the most common value they used instead.
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To help decide between these procedures, students should ask themselves a
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How many samples do I have?
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0ne. μdiff
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Two. μ1- μ2 (usually) Watch out for two samples that pair individuals.
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Can any piece of data in the first group be compared to any piece of data in the second?
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Yes. μ1- μ2
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No, they must stay in pairs. μdiff
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Do they reference pairing the data?
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Yes. μdiff
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No. μ1- μ2
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