Select the correct answer.
What is the expanded equivalent of sin(a + b)?
A.
sin a cos b - cos a sin b
B.
sin a cos b + cos a sin b
C.
cos a cos b- sin a sin
D.
cos a cos b + sin a sin b

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.