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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 friends 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 t-stat, p-value and if your null hypothesis can be rejected at the usual levels....
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- Winter '09