A researcher conducts a sample survey on the number of spam e-mails employed and unemployed people receive in a day. The data he collects is shown in the table below. Employed People Unemployed People Sample Size 9 10 Sample Mean 25 19 Pooled Standard Deviation 28 If the hypothesis is that unemployed and employed people receive the same number of spam e-mails, what is the -value? 0.47 0.93 2.47 4.07