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A manufacturer wants to increase the absorption capacity of a sponge. Based on past data, the...

  1. A manufacturer wants to increase the absorption capacity of a sponge. Based on past data, the average sponge could absorb 4.5 ounces. After the redesign, the absorption amounts of a sample of 85 sponges were 4.2 ounces. What is the critical value for this test at the 0.01 level of significance to test?
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