A jar of Jif Peanut Butter (labeled as a 32 oz. jar) is selected randomly off of the assembly line, and the weight of the jar is measured. Suppose that jar weights are normally distributed with a mean weight of 32.3 oz. and a standard deviation of 0.40 oz. F: Consider a six-pack containing six jars of Jif. Assume these jars represent a simple random xxsample of all jars produced. Let be the sample mean weight for these six jars. Isa parameter or a statistic