9.22 The nitrogen contents of red clover plants inoculated with three strains of Rhizobium are given here 3DOK1 3DOK5 3DOK7 19.4 32.6 27.0 32.1 33.0 24.6 25.5 19.4 21.7 20.8 20.7 21.0 20.5 18.8 18.6 20.1 21.3 a. Is there evidence of a difference in the effects of the three treatments on the mean nitrogen content? Analyze the data completely, and draw conclusions based on your analysis. Use a0 b. Was there any evidence of a violation in the conditions required to conduct your analysis in part (a)?
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!
9.22
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