Review the graph of a piecewise function. Which two discontinuities does the graph show?

jump discontinuity at x = –2; mixed discontinuity at x = 0
jump discontinuity at x = –2; infinite discontinuity at x = 0
endpoint discontinuity at x = –2; mixed discontinuity at x = 0
endpoint discontinuity at x = –2; infinite discontinuity at x = 0

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.