Imagine that you have data on two different production processes. You have 54 observations from process A with a sample mean of 84 and a variance of 213. You have 48 observations from process B with a sample mean of 77 and a variance of 174. Test the hypothesis that the true population mean of process A is different than process B. This question is looking for the test statistic itself. Remember that the test statistic is simply the difference between the two sample means divided by the pooled standard error. Enter your answer as a positive number rounded to the nearest 0.1.