Calculation regarding mean and median
The reaction times for a random sample of 9 subjects to a stimulant were recorded as 2.5, 3.6, 3.1, 4.3, 2.9, 2.3, 2.6, 4.1, and 3.4 seconds. Calculate
(a) The mean;
(b) The median.
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Use exponential smoothing with a smoothing constant of .2 and an initial value of 9.29 to forecast the yield for January 2007.
The Hughes Supply Company uses an inventory management method to determine the monthly demands for various products.
If X1 and X2 are independent random variables, X1 has a chi-square distribution with 3 degrees of freedom. Prove that X2 has a chi-square distribution with 4 degrees of freedom.
Calculate all forecasting smoothing methods that you know (naïve, exponential smoothing, 2PMA, 3PMA, and ???) and determine the best method. Rank all the methods starting from the best. Support each method with a graph.
Assuming all sex distributions to be equally probable, what proportion of families with exactly six children should be expected to have three boys and three girls?
A maker of a certain brand of low-fat cereal bars claims that their average saturated fat content is 0.5 gram. In a random sample of 8 cereal bars of this brand the saturated fat content was 0.6. 0.7. 0.7. 0.3. 0.4. 0.5, 0.4, and 0.2, would you ag
A certain type of thread is manufactured with a mean tensile strength of 78.3 kilograms and a standard deviation of 5.6 kilograms. How is the variance of the sample mean changed when the sample size is?
The probability that a vehicle entering the Luray Caverns has Canadian license plates is 0.12; the probability that it is a camper is 0.28; and the probability that it is a camper with Canadian license plates is 0.09. What is the probability that
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