Professor jordan has suggested to his students that a strong relationship exists between the number of hours they spend studying and their grade on the final exam. he would like his students to improve their test scores by increasing the time they spend studying. the professor is describing a.
a. mean score.
b. negative correlation.
c. positive correlation.
d. standard deviation.

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.