Question: A manufacturer of detergent claims that the mean weight of a particular box of detergent is at least 3.25 pounds. A random sample of 81 boxes reveals a sample average of 3.18 pounds and a sample standard deviation of 0.15 pounds. Using a 0.10 level of significance, is there evidence that the average weight of the boxes is different from at least 3.25 pounds as stated above?