Assume the average puppy weighs 10 pounds. A sample of 10 puppies yields the sample mean of 13.2 pounds and sample standard deviation of 2.78 pounds. Suppose the population standard deviation is known to be 5.25. You want to test whether the sample mean differs from population mean of 10 pounds at the 5 percent level of significance using a two-tailed test. Compute the test statistic for the sample data.