Each test grade in sara's science class counts for 1/6 of the final grade. the final exam counts for 1/2. sara's test scores are 72, 84, and 90. her final exam score is 90. what is sara's final grade for the class? a) 83 b) 86 c) 87 d) 89,

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.