Gradescope submission link for Question 3: Fall2025 Midterm…
Gradescope submission link for Question 3: Fall2025 Midterm Question3 Q3 Full regression model. (13 points) Use the trainData for this question. a) Fit a regression model using all the predictors in the dataset. Call it model4. Display the summary. Which variables appear statistically significant at the 0.01 level? (3 points)i) What is the residual standard error of this model. Briefly interpret what this number represents in the context of predicting starting_salary_usd. (1 point) b) Evaluate the residuals of model4 (full model) to determine if heteroskedasticity is present. Explain your conclusion. (3 points) c) Run the diagnostic check for normality for model4 (full model). Explain your conlcusion. (3 points) d) Calculate the 95% confidence intervals for all the coefficients of the full model created in Question 3a. Provide an interpretation of the confidence interval for the coefficient of ‘remote_ratio’. (3 points)
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Assessment Submission Directions You are going to upload your all work for #12 using your external camera. If you are unable to use your external webcam, please scan or take a picture of your handwritten work with a phone or device. Airdrop or email it to yourself. Any question requiring a calculation should show work, correct answers with no work at most earn 1 point. Upload all work here in a single pdf format. Work needs to be uploaded at the conclusion of the assessment. If the assessment finishes prior to you being able to upload work you are to email your work to Mr. Wilson at kwilson@dwight.global immediately, but this should not be a regular occurrence. Additional time has been added to the assessment to allow for time to upload your work. Work submitted well after the assessment has been completed will not be used in the grading of the assessment. To access your Gmail to retrieve your written work – click the link below. https://mail.google.com/mail/u/0/#inbox If you’re able to use airdrop to send the file to your computer, then you won’t need the Gmail link above to retrieve your work. If you have trouble, connect to Honorlock support by clicking the blue button with the speech bubble. They will help and document your attempt to correct the situation. Tell the support agent you are done with the test and are having trouble submitting your work. They will help you momentarily bypass the blocking program Honorlock uses to get your file uploaded properly. Remember: You are expected to turn your work in before the exam closes. If your work is not uploaded during the exam, you will be contacted by your teacher. If you know that there was a problem, email your teacher immediately and describe the situation and the steps that you took to correct it. Your proactivity and ability to explain your actions will ensure that the instant is not viewed as an Honor Code violation. Upload
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