BU510.650 – Data Analytics, Spring 2021Sample Questions -- SolutionsNote: This document is not meant to reflect the length or distribution of topics for the actualexam. Its goal is to familiarize you with the exam style.1.For each statement below, choose True or False.(a)All model selection methods (best subset selection, forward selection, and backward selection) leadto the same set of input variables (predictors).TRUEFALSE
(b)Adding an input variable (predictor) to a linear regression will never reduce R2.
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(c)Adding an input variable (predictor) to a linear regression will never reduce the adjusted R2.
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2.We run linear regression for Revenue (as the output variable (response), in million $) and Salesforce(as the input variable (predictor)) based on training data in the previous 200 periods (weeks). Thefollowing is part of the summary output of this linear regression.Answer the following questions based on the above summary output.