The filling machine at a bottling plant is operating correctly when the variance of the fill amount is equal to 0.3 ounces. Assume that the fill amounts follow a normal distribution. (i) What is the range of probabilities that for a sample of 30 bottles, the sample variance is greater than 0.5? Explain your answer. (ii) If the probability is 0.10 for a sample of 30 bottles, what number is the sample variance less than? Explain your answer.
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!
The filling machine at a bottling plant is operating correctly when the variance of the fill amount is equal to 0.3 ounces. Assume that the fill amounts follow a
(i) What is the range of probabilities that for a sample of 30 bottles, the sample variance is greater than 0.5? Explain your answer.
(ii) If the probability is 0.10 for a sample of 30 bottles, what number is the sample variance less than? Explain your answer.
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