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4. The pH of an acid solution used to etch aluminum varies somewhat from batch to batch. In a sample of 50 batches the mean

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4. The pH of an acid solution used to etch aluminum varies somewhat from batch to batch. In a sample of 50 batches the mean pl was 2.6, with a standard deviation of 0.3. Let / represent the mean pl for batches of this solution. Page 410 a. Find the P-value for testing Ho : u 2.5. b. Either the mean pH is greater than 2.5 mm, or the sample is in the most extreme % of its distribution

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