in quadrilateral abcd, diagonals ac and bd bisect one another:

what statement is used to prove that quadrilateral abcd is a parallelogram?

a.) angles bad and adc are congruent
b.) corresponding angles bcd and cda are supplementary
c.) sides cd and da are congruent
d.) triangles bpa and dpc are congruent

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.