Jump to level 1 A major retailer promises 2 day shipping for certain online orders. A consumer advocacy group believes that the shipping times are longer at a significance level of 0.05, and checks a randomly chosen sample of 400 orders. The results of the sample are given below. Shipping times Mean 105502454 Variance [148326032 Observations 400 Hypothesized Mean 2 df 399 t Stat 1.511824412 P[T<: onetail critical one-tail p two-tail . r twotail tstatistic="Ex:" pvalue="Ex:" since the p-value is i pick v ihan significance level null hypothesis sufcient evidence iexist that mean shipping time greater than days. mamn>