Our bodies have a natural electrical field that is known to wounds heal. does changing the field strength slow healing? a series of experiments with newts investigated this question. the data below are the healing rates of cuts (micrometers per hour) in a matched pairs experiment. the pairs are the two hind limbs of the same newt, with the body's natural electric field in one limb (control) and half the natural electric value in the other limb (experimental). we're interested in knowing whether canceling the body's electric field reduces the healing rate. give a 90% confidence interval for the difference in healing rates (control minus experimental). newt 1 2 3 4 5 6 7 8 9 10 11 12 13 14 control 25 13 44 45 57 42 50 36 35 38 43 31 26 48 experimental 24 23 47 42 26 46 38 33 28 28 21 27 25 45 to

1: -2 3/4, -2 1/2, -14, 0, 3, 8 1/3

2: -4, -3, -2 1/2, -2 1/4, 3 1/4,

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"it's not the heat, it's the humidity".   that's a partly valid phrase you may have heard in the summer, but it's actually both.   the heat index, also known as the apparent temperature, is what the temperature feels like to the human body when relative humidity is combined with the air temperature.   this has important considerations for the human body's comfort.   when the body gets too hot, it begins to perspire or sweat to cool itself off.   if the perspiration is not able to evaporate, the body cannot regulate its temperature.   evaporation is a cooling process.   when perspiration is evaporated off the body, it effectively reduces the body's temperature.   when the atmospheric moisture content (i.e. relative humidity) is high, the rate of perspiration from the body decreases.   in other words, the human body feels warmer in humid conditions.   the opposite is true when the relative humidity decreases because the rate of perspiration increases.   the body actually feels cooler in arid conditions.   there is direct relationship between the air temperature and relative humidity and the heat index, meaning as the air temperature and relative humidity increase (decrease), the heat index increases (decreases).

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