Two groups of person consis A drug is administered to 5 persons and the Blood pressure before AND after was measured. The results are given below Candidates : I II III IV V Before : 140 130 132 150 140 After : 132 126 133 144 133 Test whether the drug is effective in lowering the systolic Blood pressure at 5% Level of significanceting 400 and 500 persons have mean heights 68.5 inches and 66.1 inches and variance 6.4 and 6.0 respectively. Examine whether the difference is significant.
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