Theoretical questions: Regression without intercept(40 pts) In this question, we consider a two-variable regression model when...
Theoretical questions: Regression without intercept(40 pts) In this question, we consider a two-variable regression model when there is no intercept in the model: There is no intercept x0 in the model. Suppose we have n different samples. Then answer the following questions: (b) Write the explícit solution of βι and函, in terms of Ση 1 гг, Σί.1 za, Σ-1 zazi2Σ㈡ raVi and Σ-1Equ.(30 pts) (Hint: You can refer to the SLR example in slides, they have similar idea)
Theoretical questions: Regression without intercept(40 pts) In this question, we consider a two-variable regression model when there is no intercept in the model: There is no intercept x0 in the model. Suppose we have n different samples. Then answer the following questions: (a) Write the design matrix X for our model, using the subscript notation we introduce in class.(10 pts)
Question 13 2.5 pts For Questions 13 - 22, consider the following scenario: An analyst for an e-commerce website would like to use a regression model to predict the total amount that customers spend per order. The analyst theorizes that income may help explain order total. An a = 0.05 significance level will be used for this analysis. The analyst randomly samples customers. Total Order Amount was measured in dollars, Income in thousands, The data was used to estimate a...
Need help with stats true or false questions Decide (with short explanations) whether the following statements are true or false a) We consider the model y-Ao +A(z) +E. Let (-0.01, 1.5) be a 95% confidence interval for A In this case, a t-test with significance level 1% rejects the null hypothesis Ho : A-0 against a two sided alternative. b) Complicated models with a lot of parameters are better for prediction then simple models with just a few parameters c)...