Comparing the graphs of y = ax² and y = x², what is the effect on the graph, y = ax², for 0
a. The graph is getting narrower.
b. The graph is getting wider.
c. The graph is reflected over the x-axis.
d. The graph is reflected over the y-axis.

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.