A dietitian wishes to see if a person's cholesterol level will change if the diet is supplemented by a certain mineral. Six randomly selected subjects were pretested, and then they took the mineral supplement for a 6-week period. The results are shown in the table. (Cholesterol level is measured in milligrams per deciliter.) Can it be concluded that the cholesterol level has been changed at \(\alpha=0.10\) ? Assume the variable is approximately normally distributed.

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Subject I 2 3 4 5 6 Before (X1) 210 235 208 190 172 244 After (X2) 190 170 210 188 173 228