What are the strengths and the weaknesses of experimental designs?
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What are the strengths and the weaknesses of experimental designs?
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- Suppose when you add flexibility to your model by adding higher-order terms or more predictor variables that you begin to see the test or validation error (MSE or SSE evaluated on the test or validation set) begin to increase away from the training error. What kind of a problem are your models experiencing?What is a dummy variable trap and how is it related to multicollinearity of regressors? What is the solution for this form of multicollinearity?You oversee assessing different training methods for effectiveness. You have data on 4 methods: Method 1 (?1 = 87, ?1= 12), Method 2 (?2= 92, ?2 = 14), Method 3 (?3= 88, ?3 = 15), and Method 4 (?4=75, ?4 = 11). Test for differences among these means, assuming ??B=64.81 and ??T=399.45.
- One of the main issues that censuses are not considered as a feasible option for studies beside being logistically demanding is: Select one: a. Populations contains too many variables and cannot be analyzed. b. Censuses are not accurate because we cannot use statistics with it. c. None of the mentioned reasons is a valid reason. d. Samples are easier to work with than census that is what makes use samples. e. Populations are dynamic and very rarely stand still.You conducted additional studies with these men and found the following: The RR for those who drank one drink per day was 1.50 (95% CI:1.32-1.67) in comparison to the abstainers. For those men who drank three or more drinks per day the RR compared to the abstainers was 4.20 (95% CI 2.68-5.85). Which one of Hill’s criteria does this illustrate? Explain.please help me with this study problem.
- The Service Corps of Retired Executives collected the data below to see if their small business consulting work in New Orleans changed at Hurricane Katrina. Their results are summarized in this table. (Academy of Strategic Management Journal, Volume 7, Special Issue, 2008) Before Katrina After Katrina State your conclusion in the context of this problem. Type of contact Face to Face Online 729 291 346 223 BIUAA LEE x x, EE 12pt DELL Telephone 12 25 Paragraph 5 GWhat can you say from the models given? Maybe about the multicollinearity.In a group of 39 students, there are 23 girls. All the students were asked if they did Quantitative Methods (QM) or Accounting (A). The responses were; 19 do QM 16 do A 5 boys do QM and A 9 girls do QM only 1 boy does A only 3 girls do QM and A Twice as many boys as girls, do not do QM or A Required: The number of students doing neither of the TWO courses is?
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