Rashmi works at a home for dogs. She has 4 types of dog food to feed the dogs.
She takes at random a tin of dog food.
The table below shows the probabilities that Rashmi will take a tin of lamb dog food or
a tin of beef dog food or a tin of turkey dog food.
Dog Food
lamb
beef
chicken
turkey
Probability
0.35
0.25
0.30
Work out the probability that Rashmi will take a tin of turkey dog food or a tin of lamb
dog food.

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.