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Shown below is data on factory orders for all manufacturing, durable goods, and non-durable goods industriesover a 13-year period ($ billion).
a ) Use thisdata to develop forecasts for the years 6 through 13 using a 5-year moving average.
b) Use thisdata to develop forecasts for the years 6 through 13 using a 5-year weighted moving average. Weight the most recent year by 6, the previous year by 4, the year before that by 2, and the other years by 1.
c) Compute the errors of the forecasts in parts (a) and (b) and then the mean absolute deviation (MAD). Which forecast is better?
Random samples of 2009 pickup trucks with 4 cylinder, 5 cylinder, 6 cylinder, and 8 cylinder engines were obtained. Each pickup truck was tested for miles per gallons in highway driving
Suppose you are on a test and are asked to determine whether the given experiment is binomial, Poisson, or neither. What are you going to think about to determine which test to use. Do you have a checklist? How would you approach this problem?
No information is available about its value. How large a sample size is needed to estimate it to within 0.15 with 99% confidence?
Mean and standard deviation are 584.6 and 34.28
In a randomly controlled trial conducted with children suffering from croup, 46 randomly selected children were treated with ow humidity while another group of randomly selected children were treated with high humidity.
In a sample of 88 children selected randomly from one town, it is found that 8 of them suffer from asthma. Find the P value for a test of the claim that the proportion of all children in the town who suffer from asthma is equal to 11%.
How much should a healthy shetland pony weigh? Let X be the age of the ponies in months and y be the average weight of the ponies, in kilograms.
Many people believe that criminals who plead guilty tend to get lighter sentences than those who are convicted in trials. The accompanying table summarizes randomly selected sample data for San Francisco defendants in burglary cases. All of the su..
Do women and men have different opinions about affirmative action? Based on a sub sample of 2008 GSS, the output figure below shows respondent's sex (sex) and attitudes toward affirmative action (DISCAFF: Are whites hurt by affirmative action).
The camera department of a large department store sells three different brands of cameras: Proxima, Yakima, and Tetron. Approximately 60% of the cameras sold are Yakimas with Tetrons accounting for 30% of sales and Proxima the remaining 10%.
The heights of 10 sixth graders are listed in inches: {53, 61, 54, 60, 58, 62, 55, 58, 59, 56}. Find the mean, median, mode, sample variance, and range.
Found to have SL concentration of 30ng/ml and sample variance 0.5ng/ml. Does this provide significant evidence that the SL level in maturing male salmon is greater than that of non-maturing male salmon?
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