#1 The accounting firm Addupt, Hetotals & Dee-Vide has 300 employees. They are
concerned that one of its competitor's mean salary of $45,000 is better than their
average. A random sample of 45 of the firm's accountants has a mean salary of
$43,500 with a standard deviation of $5,200. Is the firm's mean salary lower?
b. Construct a 90% confidence Interval for the firms mean salary.

8. kelly wants to buy a magazine that is $25. later the magazine was marked up an additional 20%. what is the new price?

Answer! if you don’t mind, can you explain

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.