An article in quality engineering ["designed experiment to stabilize blood glucose levels" (1999–2000, vol. 12, pp. 83–87)] described an experiment to minimize variations in blood glucose levels. the treatment was the exercise time on a nordic track cross-country skier (10 or 20 min). the experiment was blocked for time of day. the data were as follows:

Write two subtraction equations that are equivalent to 5 + 12 = 17.

Need now max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a) the median of max’s data is 250 b) more than half of the data points max recorded were 177 centimeters. c) a data point chosen at random is as likely to be above the mean as it is to be below the mean. d) every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.

X+y=-4 x-y=2 use elimination with adding and subtraction