In an effort to link cold environments with hypertension in humans, a preliminary experiment 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.

a. Do the data provide sufficient evidence that rats exposed to α =° C environment have a higher mean blood pressure than rats exposed to a 26° C environment? Use α = .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.

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26°C 5 C Rat Blood Pressure Rat Blood Pressure 152 157 179 384 369 354 375 10 1 149 423