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What is the critical value

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A researcher is examining depression questionnaire scores for individuals who are taking a new depression medication. She knows the population data on the questionnaire is μ = 58, σ = 7.5. She administers a new anti-depression medication to depressed patients and has them take the depression questionnaire. She wants to know if the depression medication decreases their depression scores. Test at α = .01.

What is the critical value? (include the +/- symbol as necessary)?

Reference no: EM132581541

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