1.There was a very short quiz with. The following table shows the number of correct answers and the cumulative relative frequency for those scores in

the class.

value: 2 3 4 5

RF .13 .55 .925 1

What is the probability that a randomly selected student from the class scored a 3 on

the short quiz?

2.A Poisson distribution called Q has an expectation of 4. Which of the following R

commands would tell you the probability that a randomly selected value from Q is

less than 6 and greater than or equal to 4 (read the question carefully)

a. ppois(6, 4) - ppois(3, 4)

b. ppois(6, lambda=4) - ppois(4, lambda=4)

c. ppois(5, 4) - ppois(3, 4)

d. ppois(5, 4) - ppois(4, 4)

e. ppois(6 - 4, lambda=4)

3. You read a research paper that applies to your industry, and it says that when

people are given a list of facts about your product, they are more likely to buy your

product and that the difference between the regular amount of sales and the sales

when people read the list of facts is 3 standard deviations. How would you describe

the difference of three standard deviations.

a. Can not tell because the units are not specified

b. It is a small difference because 3 is a small number

c. It is an important difference because a 3 standard deviation difference would be

expected due to random chance in less than 1% of the cases.

d. It is NOT an important difference because with each sample there is variation and

the difference could be due to chance.

e. Can not tell because the sample size is not given