Which expression should you simplify to find the 90% confidence interval, given a sample of 65 people with a sample proportion of 0.42?
A. 0.42 + 65
0.42(1-0.42)
1.645
OB. 0.42 +
1.645-0.42
65
C. 0.42 +1.645.
0.42(1-0.42)
65
D. 0.42 + 1.645.
0.42(1–0.42)
65

Peter applied to an accounting firm and a consulting firm. he knows that 30% of similarly qualified applicants receive job offers from the accounting firm, while only 20% of similarly qualified applicants receive job offers from the consulting firm. assume that receiving an offer from one firm is independent of receiving an offer from the other. what is the probability that both firms offer peter a job?

An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.

What is the product? a-3/15a × 5/a-3