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MAD, MSE and MAPE for forecasting.
Compute (a) MAD, (b) MSE, and (c) MAPE for the following forecast versus actual sales figures.
Statistics and Probability, Statistics
Suppose that a certain college class contains 49 students. Of these, 24 are seniors, 26 are English majors, and 9 are neither. A student is selected at random from the class. (a) What is the probability that the studen ...
A national survey of 40,000 adults in the US in 1992 found that 26% of adults were current smokers. A similar survey of 37,000 adults in the US in 1966 found that 43% of adults were current smokers. Construct a 95% confi ...
An article in Archaeometry involved an analysis of 48 samples of Romano-Britishpottery, found at four different kiln sites in the United Kingdom. The samples were analyzed todetermine their chemical-composition. The perc ...
1. A successive independent survey design and a longitudinal survey design both examine changes in responses over time. How do they differ in their approach? 2. Distinguish between demographic and epidemiological researc ...
Roger reports: I ascribe probability 0.3 to "the Philadelphia Phillies will win the World Series next year, Chris ascribes probability 0.4 to their winning the World Series and to me ascribing probability 0.4 that they w ...
Thirty percent of the time, a sale at Food Shoppe is paid using a store-issued credit card. A sample of 18 Food Shoppe sales is obtained. Let X represent the number of sales paid for using the store-issued credit card. W ...
1. What are the most important threats to validity that occur in quasi experimental research designs when the research is conducted over a period of time? What techniques can be used to minimize these potential interpret ...
1. Why do researchers care how much variability exists in a set of data? 2. Distinguish between descriptive and inferential statistics. 3. Conceptually, what does the variance tell us about a set of data?
Prove that if Romeo and Juliet are matched to each other under both the men's courtship and the women's courtship algorithms, then they are matched to each other under any stable matching.
The University is attempting to set its staffing plan for the next several year, and it wants to determine if the distribution of students among various graduate majors has changed from the historical averages which were ...
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