At wind speeds above 1000 centimeters per second, significant sand-moving events begin to occur sand is moved to new locations. The cyclic nature of wind and moving sand determines the shape and locations of large dunes. At a test site, the prevailing direction of wind did not change noticeably. However, the velocity did chnage. Sixty wind speed readings gave an average velocity of 1075 cm/sec (standard deviation weas 265 cm/sec). The researcher wants to determine if the wind speed is such that the sand is always moving at this site. Use alpha = 0.10.
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!
At wind speeds above 1000 centimeters per second, significant sand-moving
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