9.63  Increases in worker injuries and disability claims have prompted renewed interest in workplace design and regulation. As one particular aspect of this, employees re- quired to do regular lifting should not have to handle un- safe loads. The article “Anthropometric, Muscle Strength, and Spinal Mobility Characteristics as Predictors of the Rating of Acceptable Loads in Parcel Sorting” (Ergo- nomics [1992]: 1033–1044) reported on a study involv- ing a random sample of n = 18 male postal workers. The sample mean rating of acceptable load attained with a work-simulating test was found to be x = 9.7 kg. and the sample standard deviation was s = 4.3 kg. Suppose that in the population of all male postal workers, the distribution of rating of acceptable load can be modeled approximately using a normal distribution with mean value m. Construct and interpret a 95% confidence interval for m.