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

           
   Person   Before   After
   1   176   164
   2   192   191
   3   185   176
   4   177   176
   5   196   185
   6   178   169
   7   196   196
   8   181   172
   9   158   158
   10   201   193
   11   191   185
   12   193   189
   13   176   175
   14   212   210
   15   177   173
   16   183   180
   17   210   204
   18   198   192
   19   157   152
   20   213   200
   21   161   161
   22   177   166
   23   210   203
   24   192   186
   25   178   170

What is your conclusion?

A. Do not reject the NULL Hypothesis because the actual value isgreater than critical value

B. Reject the NULL Hypothesis because the actual value is lessthan the critical value

C. Reject the NULL Hypothesis because the actual value isgreater than critical value

D. Do not reject the NULL Hypothesis because the actual value isless than the critical value