BeA national shipping company advertises that standard shipping can take up to seven days. If you were to write the null hypothesis in words,
what would it be?. *
A. "The true mean shipping time would be 7 days or more"
B. "The true mean shipping time would take 7 days or less"
C. "The true mean shipping days would take more than 7 days"
D. "The true mean shipping time would take less than 7 days"

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.