Write a brief description in which you outline how you would obtain a random sample of 102 West Texas water wells. Explain how random numbers would be used in the selection process. O One could assign consecutive numbers to each well in Texas and then use a random number table or a computer package to draw the simple random sample. O One could assign consecutive numbers to each well in several neighborhoods of Texas and then use a random number table or a computer package to draw the simple random sample. O One could assign consecutive numbers to each well in the most rural areas of West Texas and then use a random number table or a computer package to draw the simple random sample. O One could assign consecutive numbers to each well in West Texas and then use a random number table or a computer package to draw the simple random sample. O One could assign consecutive numbers to each well in one neighborhood of West Texas and then use a random number table or a computer package to draw the simple random sample.
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!
In West Texas, water is extremely important. The following data represent pH levels in ground water for a random sample of 102 West Texas wells. A pH less than 7 is acidic and a pH above 7 is alkaline. Scanning the data, you can see that water in this region tends to be hard (alkaline). Too high a pH means the water is unusable or needs expensive treatment to make it usable.† These data are also available for download at the Companion Sites for this text. For convenience, the data are presented in increasing order.
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