CWP Test Questions With 100% Correct Answers Latest Updated | Graded A+

CWP Test Questions With 100% Correct Answers Latest Updated | Graded A+. I am using x to predict y. When I know the value of x, the mean-squared-error of my estimate of y is less than when I don't know x. - answer-x explains some of the variance in y If the SSmodel is greater than the SSresidual... - answer-the model accounts for more than 50% of the total variance What is the coefficient of determination? - answer-The proportion of variance accounted for in the dependent variable by the predictor variables. What is the relationship between r and beta in a simple regression? - answer-beta is an unstandardised measure of r What is the critical value for t with 5 degrees of freedom and an alpha of 0.05 twotailed? Give your answer to 2 decimal places. - answer-2.57 You have the following data: x = c(10,3,2,1,3,4,5,6) y = c(2,14,18,12,10,11,8,9) You run a linear model and get the following estimate of the slope: ^B1 = -1.423 What is the standardised beta? Report to 2 decimal place - answer--0.86 If I have a lot of error in my regression model, it means that: - answer-There are big differences between the line specified by my model and the corresponding points on the scatterplot. If the beta for your x term in a regression model is negative, it means: - answer-That there as x increases, y decreases. I conduct a study to investigate whether average hours of sleep per nigh (x) predicts sick days per year (y). I find the follow values for the intercept and slope: B0 = 25 B1 = -1.6 CWP Test Questions With 100% Correct Answers Latest Updated 2024- 2025 | Graded A+ True or false, the following is the correct interpretation of the intercept: A person who sleeps 0 hours on average per night is expected to have 24 sick days per year. - answer-False I conduct a study to investigate whether average hours of sleep per nigh (x) predicts sick days per year (y). I find the follow values for the intercept and slope: B0 = 25 B1 = -1.6 True or false, the following is the correct interpretation of the slope: For every hour of sleep a person has on average per night, the number of sick days per year decreases by 1.6 days. - answer-True What is the critical value for t with 5 degrees of freedom and an alpha of 0.01 twotailed? Give your answer to 2 decimal places in the form X.XX - answer-4.03 You run a linear model with a single binary predictor. The intercept for the model is 110, and the unstandardized beta is 17.1. What is the mean of the group coded 1? - answer-127.1 You run a linear model with a single binary predictor (0 = Group0; 1 = Group1). The mean of Group1 is 75 and the beta coefficient is 7. What is the value of the intercept? - answer-68 If regression model errors (residuals), show different amounts of variation across the range of measurement, they are referred to as ... - answer-Heteroscedastic Match the assumption/diagnostic to the most appropriate test. Shapiro-Wilk Test - answer-Normality of residuals Match the assumption/diagnostic to the most appropriate test. Durbin-Watson Test - answer-Autocorrelation of residuals Match the assumption/diagnostic to the most appropriate test. Non-constant variance test - answer-Heteroscedasticity Match the assumption/diagnostic to the most appropriate visualization. Histogram - answer-Normality of residuals Match the assumption/diagnostic to the most appropriate visualization. Scatterplot - answer-Linearity Match the assumption/diagnostic to the most appropriate visualization. Residual-vs-predicted plot - answer-Heteroscedasticity The null hypothesis for the non-constant variance test (Breusch-Pagan test) is that the data are heteroscedastic. True or False? - answer-False What are the degrees of freedom for the sums of squares total in a linear model? - answer-n-1 Which R function can be used to calculate from a model object? - answer-predict() In a simple linear model where both variables are continuous and z-scored, what is the value of the intercept? - answer-0 The null hypothesis for the non-constant variance test (Breusch-Pagan test) is that the data are heteroscedastic. True or false? - answer-False In testing model assumptions and appropriateness, what quantities summarise the influence of an individual case on the predicted values for that same case? - answerCook's distance Given the following: hat y = 10.5 + 4.3*x What is the predicted score for someone scoring 7 for x? Give you answer to two decimal places in the form X.XX - answer-40.60 Assuming we have a data set called df, that contains variables called DV and IV, the following R code will run without error? lm(DV ~ IV data = df) True or false? - answer-False In multiple regression high leverage values would have... - answer-X values far from the centroid of X Suppose we have a study with: Sample size (n) = 73 Number of predictors (k) = 11 Which of the following would be considered high influence cases based on Di 4/(nk-1) ? - answer-Cook's distance = 0.09 What is the critical value for F with 5,58 degrees of freedom and an alpha of 0.05? Give your answer to 2 decimal places in the form X.XX - answer-2.37 Given the following linear model equation: y = 10 + 6x(1) + 2x(2) + 3x(3) What would the predicted score for Y be for an individual with the following scores: x1 = 2 x2 = 6 x3 = 0 - answer-34 I have a categorical variable (`condition`) with 4 levels and the following group means: Control = 32 Group 1 = 23 Group 2 = 10 Group 3 = 5 I use this variable to predict an outcome variable (`test_score`). The two variables are in a data frame called `df`. I run the following code in R: