The table below shows the weights of seven subjects before and after following a particular diet for two months.

Subject / A / B / C / D / E / F / G

Before / 151 / 154 / 152 / 150 / 152 / 153 / 152

After / 153 / 151 / 151 / 155 / 152 / 151 / 153

Using a 0.05 level of significance, test the claim that the diet is effective in reducing weight (after minus before is negative). Use the critical value method of hypothesis testing.

Enter the smallest critical value. (Round your answer to nearest thousandth.)