For this question, please use minivan_hw2_modified.csv . You can download it by right click and save as.  Suppose you want to perform a regression of quantity sold (q_sold) on average price (ave_p). Which formula would you choose?  

For this question, please use minivan_hw2_modified.csv . You can download it by right click and save as.  Please perform a logistic regression of promotion on quantity sold. What is the estimated parameter on quantity sold?

Please choose the appropriate statistic to evaluate the statistical significance of the parameter of an explanatory variable in a regression. 

For this question, please use dec_data_modified.csv and download it by right click and save as.  Please construct a training data set and a testing data set by using 80% and 20% of the master data, respectively. To ensure the replicability of the exercise, please set the random seed to 1.  What is the number of observations assigned to the training data?

A linear regression is used for all of the following except one. Which one is not a valid use of  linear regression?

Suppose you want to plot price and quantity, and you want to place price in the vertical axis and quantity in the horizontal axis. Which command would accomplish this task?

For this question, please use dec_data_modified.csv and download it by right click and save as.  Fit the classification tree to the training data using “rpart” as we did in homework 5. To ensure the replicability of the exercise, please set the random seed to 1. What is the accuracy using the fitted tree and the testing data?

Analyze the PC manufacturing industry in the world using Porter’s five-forces model. Internal rivalry is

Analyze the Windows PC manufacturing industry in the world using Porter’s five-forces model. The pressure from buyer power is

Which of the following statements about common software architecture styles is not true?