According to the IRS, the average refund in the 2011 tax year was $3,109. Assuming that the standard
deviation for these refunds was $874, what is the standard error of the mean for a random sampl
A novel on the Amazon.com web site has the following ratings, in number of stars, from reviewers:
Number of Stars
What is the mean of this distribution?
A random sample of 30 business students required an average of 43.4 minutes to complete a statistics exam.
Assume that the population standard deviation to complete the exam was 8.7 minutes. The 9
Which of the following experiments does not generate a continuous random variable?
A) measuring the number of ounces of soda in a bottle
B) counting the number of customers who enter a store durin