As the sample size increases, the variability among the sample ...

[ericka1]

As the sample size increases, the variability among the sample means _____.
 a. increases
  b. decreases
  c. remains the same
  d. depends upon the specific population being sampled

Question 2

A salesperson contacts 8 potential customers per day. From past experience, we know that the probability of a potential customer making a purchase is .10.
 a. Define the random variable in words for this experiment.
  b. What is the probability the salesperson will make exactly 2 sales in a day?
  c. What is the probability the salesperson will make at least 2 sales in a day?
  d. What percentage of days will the salesperson not make a sale?
  e. What is the expected number of sales per day?

[lgoldst9]

Answer to Question 1

b

Answer to Question 2

a. x = the number of sales made out of 8 contacts
b. .1488
c. .1869
d. 43.05
e. .8