A journal article reports that the mean cost for a certain medical procedure in the US is $45,000 with a standard deviation of $4,000 (assume that this is the population standard deviation). You want to test whether the mean cost for this procedure is different at your hospital. You take a random sample of 100 of these procedures and find the mean cost is $44,500. Does this significantly differ from what was reported in the article? Run the appropriate test at α=0.05.