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In a hospital study it was found that the standard

In a hospital study, it was found that the standard deviation of the sound levels from 20 randomly selected areas designated "casualty doors" was 4.1 dBA and the standard deviation of 24 randomly selected areas designated as "operating theaters" was 7.5 dBA. At α = 0.05, can you substantiate the claim that there is a difference in the standard deviations?

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