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Given the following data, use exponential smoothing with a=0.2 and a=0.5 to generate forecasts for periods 2 through 6. Use MAD and MSE to decide which of the two models produced a better forecast.
Period Actual Forecast
1 15 17
2 18
3 14
4 16
5 13
6 16
47% of students have children under 17 living at home with them. Find the probability that a random sample of 800 students will return more than 50% students with children under 17 living at home with them.
Consider a liter of 5 puppies (3 brown/2 black). Draw a probability tree indicating the probabilities for selecting 3 puppies without replacement? What is the probability that I will select 3 brown puppies? 1 brown and 2 black puppies? At least 1 ..
He would like 95% confidence intervals for the average price people would be willing to pay: one for the higher-income group, one for the lower-income group.
Operations manager thinks that only 10% of room service orders must take longer than 25 minutes if hotel has good customer service. Does hotel room service fulfil this goal?
Testing for Population mean - Can the difference in average educational level between the sample and the nation be explained by chance variation?
If a 99% confidence interval is calculated to estimate the difference between the average hourly rates for each type of graduate, what is the margin of error? Assume both population standard deviations are equal.
High precision titanium spheres are popular components in manufacturing of ball bearings. A factory has ordered a shipment of 5000 titanium spheres from aboard. It is found that the shipment has a mean radius of 1.5 cm with a standard deviation ..
What is an independent sample and what is a related sample? When should researchers use varying hypothesis tests for the different types of samples?
According to Chebyshev's Theorem, how many students scored between 23 and 95?
The random variable x, which is the number of occurrences of an event over an interval of ten minutes. It can be assumed that the probability of an occurrence is the same in any two time periods of an equal length. It is known that the mean number..
Estimate and interpret the p-value of the calculated test statistic above.
The measure of forecast accuracy that is not influenced by the measurement scale of the time series data is:
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