Online retailers like Amazon keep traditional retailers on their toes by ensuring their prices are reasonably similar. One retailer regularly checks its prices with Amazon. In the most recent comparison, it took a random sample of 39 of its products and compared their price for each product with the corresponding price on Amazon. Required:
a. To determine if there is a difference between its own prices vs. Amazon, which type of test should retailer use?
b. The test statistic was found to be 1.99. What is the p-value for the test?