In the diagram below, what is the approximate length of the minor arc ab?
20 cm
120"
o a. 31 cm
ob. 42 cm
o c. 63 cm
o d. 21 cm

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.