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Ten weeks of data on the Commodity Futures Index are 7.35, 7.40, 7.55, 7.56, 7.60, 7.52, 7.52, 7.70, 7.62, and 7.55.
a. Construct a time series plot. What type of pattern exists in the data?
b. Compute the exponential smoothing forecasts for a = .2.
c. Compute the exponential smoothing forecasts for a = .3.
d. Which exponential smoothing constant provides more accurate forecasts based on MSE?
Probability based on normal distribution. Suppose among X has a normal distribution, and find the indicated probability.
Given the following number of hours between breakdowns for 4 machines, are the machines significantly different? If so, how are they different? Which machine is the best?
How could the Central Limit Theorem apply in making a business decision? Try to provide an example from your current or future career.
I want to establish if a new product is worth marketing. At least 85 percent of the public must express interest in the product and for those that do the average cost they are willing to pay must be at least $47.50.
Explain clearly, in your own words, what is a Type I error in this context.
For the following hypothesis test where H 0 : m £10 vs. H a : m >10, we reject H 0 at level of significance a and conclude that the true mean is greater than 10 when the true mean is really 8.
The Pearson Product-Moment Correlation Coefficient (r) is a measure of linear relationship between two variables.
Assuming the population is large, which sample size will give the smallest standard deviation to the statistic and select the numbers for the first five to be interviewed.
Determine the minimum required sample size if you want to be 99% confident that the sample mean is within 2 units of the population mean given sigma = 7.8. Assume the population is normally distributed.
Regression - What factors predict duration of dyspnea in elders with heart failure?
Describe a different example of where the independent variable, while highly correlated to the dependent variable, does not cause the dependent variable to change directly.
Construct three scatter plots for: (1) percentage alcohol versus calories, (2) percentage alcohol verses carbobydrates, and (3) calories versus carbohydrates
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