Suppose your linear regression model contains 3 independent variables and exhibits homoskedastic errors. You perform a hypothesis test with two restrictions. The R2 from the unrestricted and restricted regressions are 0.4366 and 0.4149, respectively. There are 420 observations. The F-statistic in this case is.

Need asap write a short paper describing the history and differences between six sigma, waterfall, agile, and scrum models. understanding these models can give you a good idea of how diverse and interesting it development projects can be. describe what the rationale for them is and describe their key features. describe the history behind their development. at least 400 words