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Exponential smoothing with trend, with a smoothing constant of α = 0.2 and a trend smoothing constant of ß = 0.3, is being used to forecast values in a time series. At this point, the last two values have been 535 and then 550. The last two forecasts have been 530 and then 540. The last estimate of the trend factor has been 10. Use this information to forecast the next value in the time series. (Use hand calculations rather than an Excel template)
Probability calculations reveal the following information. The probability of a favourable research report = 0.59. The probability of high sales given a favourable research report = 0.95. The probability of high sales given an unfavourable research r..
the following data were obtained from a survey of college students. the variable x represents the number of
Differentiate between descriptive statistics and inferential statistics. Provide an example for each. How does correlation analysis differ from regression analysis? What does a correlation coefficient reveal? Is correlation the same as causation?
We have found the density of the sum of two independent U(0,1) variables. Use that result to find the density of the sum of three independent U(0,1) variables.
suppose we rolled a pair of fair dice and count the number of dots located and the face that lands up. describe this
rolling a pair of fair die 10 times and recording the number of times we get a 7. what is the probability of rolling
The serum cholesterol levels for men in one age group are normally distributed with a mean of 185.1 and a standard deviation of 37.8. All units are in mg/100 ml. Find the two levels that separate the top 8% and the bottom 8% of this population.
1. A major amusement park has the following num- ber of visitors each quarter from 2005 through 2009: a. Construct the four-quarter centered moving average for these data and determine the percentages of the moving average for the quarters.
Waiting time is normally distributed. Calculate the value of the test statistic for your random sample rounded to two decimal places?
Your performance as a principal depends on how well your entire group of eight-graders scores on the exam. What is the likelihood that your group of 115 eighth-graders will have an average score below 580?
A manufacturer of "low precision" 10 mm diameter ball bearings periodically takes samples and measures them to con?rm that the manu- facturing process is still on target. A random sample of 20 ball bearings resulted in diameter measurements with a..
The city housing department wants to estimate the average rent for rent-controlled apartments. They need to determine the number of renters to include in the survey in order to estimate the average rent to within $50 using a 95% confidence interva..
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