University of California, Los Angeles Midterm Quiz 2 - GT Students and Verified MM Learners | Midterm Quiz 2 | ISYE6501x

Document Content and Description Below

Midterm Quiz 2 - GT Students and Verified MM Learners Midterm Quiz 2 due Nov 8, 2020 23:00 PST Completed 90 Minute Time Limit Instructions Work alone. Do not collaborate with or copy from anyone el... se. Work the problems in any order you wish, but submit each answer before ending the exam. You may use any of the following resources: One sheet (both sides) of handwritten (not photocopied or scanned) notes If any question seems ambiguous, use the most reasonable interpretation (i.e. don't be like Calvin): Good Luck! This is the beginning of Midterm Quiz 2. Please make sure that you submit all your answers before the time runs out. Once you submit an answer to a question, you cannot change it. There is no overall Submit button. After submitting all answers, please click the "End my Exam" button, above, before exiting from ProctorTrack to complete your exam. Information for Question 1 There are five questions labeled "Question 1." Answer all five questions. For each of the following five questions, select the probability distribution that could best be used to model the described scenario. Each distribution might be used, zero, one, or more than one time in the five questions. These scenarios are meant to be simple and straightforward; if you're an expert in the field the question asks about, please do not rely on your expertise to fill in all the extra complexity (you'll end up making the questions below more difficult than I intended). Question 1 0.0/1.4 points (graded) Time from the start of a World Cup soccer match until a goal is scored Answer: Weibull You have used 1 of 1 attempt Answers are displayed within the problem Question 1 1.4/1.4 points (graded) Number of phone calls made by a telemarketer until one is answered Answer: Geometric You have used 1 of 1 attempt Answers are displayed within the problem Question 1 1.4/1.4 points (graded) Time between people entering the ID-check queue at an airport Answer: Exponential You have used 1 of 1 attempt Answers are displayed within the problem Question 1 1.4/1.4 points (graded) Time between hits on a real estate web site You have used 1 of 1 attempt Question 1 1.4/1.4 points (graded) Time from the beginning of Fall until the first snowflake is seen You have used 1 of 1 attempt Questions 2a, 2b 5.0/10.0 points (graded) Five classification models were built for predicting whether a neighborhood will soon see a large rise in home prices, based on public elementary school ratings and other factors. The training data set was missing the school rating variable for every new school (3% of the data points). Because ratings are unavailable for newly-opened schools, it is believed that locations that have recently experienced high population growth are more likely to have missing school rating data. Model 1 used imputation, filling in the missing data with the average school rating from the rest of the data. Model 2 used imputation, building a regression model to fill in the missing school rating data based on other variables. Model 3 used imputation, first building a classification model to estimate (based on other variables) whether a new school is likely to have been built as a result of recent population growth (or whether it has been built for another purpose, e.g. to replace a very old school), and then using that classification to select one of two regression models to fill in an estimate of the school rating; there are two different regression models (based on other variables), one for neighborhoods with new schools built due to population growth, and one for neighborhoods with new schools built for other reasons [Show More]

Last updated: 1 year ago

Preview 1 out of 27 pages