A forecasting model is fitted to sales data over 24 months. Forecasting errors are tabulated to reveal whether the model provides an overestimate (1) or an underestimate (2) for each month's sales. The results are – – + + + – + – – + + – – – – – – + + + + + – –. Research question: At α = .05, is the pattern random?
Answer to relevant QuestionsUsing α = .10, perform a runs test for randomness on the sample data (n = 24). XOXXXXOOOOXOOOXOOOXOOXXO An experimental bumper was designed to reduce damage in low-speed collisions. This bumper was installed on an experimental group of vans in a large feet, but not on a control group. At the end of a trial period, accident ...Below are results of braking tests of the Ford Explorer on glare ice, packed snow, and split traction (one set of wheels on ice, the other on dry pavement), using three braking methods. Research question: At α = .01, is ...A baseball player was at bat 33 times during preseason exhibition games. His pattern of hits (H) and nonhits (N) is shown (a nonhit is a walk or a strikeout). Research question: At 5 .01, is the pattern of hits ...For an x-bar chart, what percent of sample means should be (a) Within 1 sigma of the center- line; (b) Within 2 sigmas of the centerline; (c) Within 3 sigmas of the centerline; (d) Outside 2 sigmas of the centerline; ...
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