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6 5 In an effort to link cold environments with hypertension in humans a preliminary...

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6 5 In an effort to link cold environments with hypertension in humans a preliminary experi ment was conducted to investigate the effect of cold on hypertension in rats Two random samples of 6 rats each were exposed to different environments One sample of rats was held in a normal environment at 26 C The other sample was held in a cold 5 C environment Blood pressures and heart rates were measured for rats for both groups The blood pressures for the 12 rats are shown in the accompanying table Rat 1 34563 a Do the data provide sufficient evidence that rats exposed to a 5 C environment have a higher mean blood pressure than rats exposed to a 26 C environment Use a 05 b Evaluate the three conditions required for the test used in part a c Provide a 95 confidence interval on the difference in the two population means 26 C Blood Pressure 152 157 179 182 176 149 Rat 789062 10 11 12 5 C Blood Pressure 384 369 354 375 366 423

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