H2S Induces a Suspended Animation-Like State In Mice," published in Science in March 2005, explains that exposure to hydrogen sulfide can produce states of suspended animation-like hibernation or torpor in mammals that normally maintain their core body temperature despite changes in environmental temperature.7

a. As time of exposure to hydrogen sulfide increased from 0 to 6 hours, temperature dropped quite steadily from about 38 to 14 degrees Celsius. Report the approximate slope of the regression line of temperature on time.

b. When the hydrogen sulfide was removed, temperatures of the mice rose steadily back to 38 degrees by the end of 3 hours. Report the approximate slope of this regression line.

c. Another part of the experiment looked at how temperature decrease related to concentration of hydrogen sulfide; the correlation was found to be +0.975. Would typical residual size s for this regression be closer to 0 or to 9 (the approximate standard deviation of the response temperature values)?