Let s be the sample variance of a random sample of size n1 from a Normal(41,o²) population and s be the sample variance of a random sample of size n2 from a Normal(2,o²) population and the two samples are independent. Note that the two samples have the same population variance o² but µi # µ2 and n1 # n2. Define the pooled variance estimator as (n1 – 1)s} + (n2 – 1)s3 I + n2 – 2 Is s2 unbiased for o² ? Explain with precise computation. Find the distribution of . Give the reasoning of your answer. Find the variance of s.
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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