Based on a test of 20 such devices you find that x 565, Basic Statistics

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Based on a test of 20 such devices you find that x 565

An antipollution device for cars is claimed to have an average effectiveness of exactly 546.

Based on a test of 20 such devices, you find that X = 565. Assuming normality and that σ = 40, would you rule out the claim with a Type I error probability of 0.05?

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Basic Statistics: Based on a test of 20 such devices you find that x 565

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Basic Statistics: Based on a test of 20 such devices you find that x 565

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