A manufacturer wants to increase the absorption capacity of a sponge. Based on past data, the average sponge could absorb 3. 5 ounces. After the redesign, the absorption amounts of a sample of sponges were (in ounces): 4. 1, 3. 7, 3. 3, 3. 5, 3. 8, 3. 9, 3. 6, 3. 8, 4. 0, and 3. 9. For 0. 01 level of significance, what is the cut-off weight in ounces?.
