Refer to the Weight Watchers file attached.

For each paired difference, compute After-Before. In Data Analysis, t-Test: Paired Two Sample for means, select the After data for Variable 1Range. Note that the critical value output by Data Analysis for this test is always positive. In this problem, the sign of the critical value is negative corresponding to a 1-tailed test with lower reject region and negative lower critical value.

What is the t-statistic (t-score)?