Discarded Plastic The weights (lb) of discarded plastic from a sample of households is listed in Data Set 23 in Appendix: Data Sets, and the summary statistics are n = 62, x = 1.911 lb, and s = 1.065 lb. Use a 0.05 significance level to test the claim that the mean weight of discarded plastic from the population of households is greater than 1.800 lb.