Acalculus exam has a mean of µ = 73 and a standard deviation of σ = 4. trina's score on the exam was 79, giving her a z-score of +1.50. the teacher standardized the exam distribution to a new mean of µ = 70 and standard deviation of σ = 5. what is trina's z-score for the standardized distribution of the calculus exam?

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.