Doctors wanted to better understand the association between exercise and blood sugar levels. They had 100 participants run on a treadmill for anywhere from 0 to 60 minutes and then had their blood sugar levels checked. The level of sugar in the blood was measured in milligrams of sugar (mg) per deciliter of blood (dL). The results are shown below along with the line of best fit with its equation. 100 Which equation below defines the line of best line drawn on the graph? 90- A) y = 0.5x + 92 80- B) y = -60x + 100 C) y = 60x - 100 70- D) y = -0.5x + 92 60+ 10 20 30 40 50 60 Time on Treadmill (minutes) Blood Sugar Level (mg/dL)
Continuous Probability Distributions
Probability distributions are of two types, which are continuous probability distributions and discrete probability distributions. A continuous probability distribution contains an infinite number of values. For example, if time is infinite: you could count from 0 to a trillion seconds, billion seconds, so on indefinitely. A discrete probability distribution consists of only a countable set of possible values.
Normal Distribution
Suppose we had to design a bathroom weighing scale, how would we decide what should be the range of the weighing machine? Would we take the highest recorded human weight in history and use that as the upper limit for our weighing scale? This may not be a great idea as the sensitivity of the scale would get reduced if the range is too large. At the same time, if we keep the upper limit too low, it may not be usable for a large percentage of the population!
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