The volume of a stock is the number of shares traded for a given day. Several years ago, a certain company's stock had a mean daily volume of 7.52 million shares, according to a reputable financial news outlet. A random sample of 40 trading days in a recent year was obtained and the volume of shares traded on those days was recorded, with the accompanying results. Complete parts (a) through (d) below. Click the icon to view the shares data.Find the test statistic. (Round to two decimal places as needed.)