Unformatted text preview: greater than 100? What is the probability that the sample mean is negative? 3. Random variable X~(5,10000) follows an Erlang distribution. A friend of yours takes a sample of 100 observations anyway, calculates the sample mean of 24.6 and maintains that ( 29 24.6 P X < =.975. Comment on your friend’s statement. 4. Assume you give a test to 100 individuals and calculate a sample mean score of 120 and a sample variance of scores of 10000. Test the hypothesis that the true population mean equals 100. Report tstat, pvalue and if your null hypothesis can be rejected at the usual levels....
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 Winter '09
 Pavan
 Variance, Probability theory

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