Exam 27: Exploring Relationships Among Variables

Use the following to answer the question(s) below. Data were collected for a sample of 12 pharmacists to determine if years of experience and salary are related. Below are the regression analysis results. The dependent variable is Salary in thousands of dollars. -How much of the variability in pharmacists' salary is accounted for by years of experience?

Use the following to answer the questions below. The following is output from regression analysis performed to develop a model for predicting a firm's Price-Earnings Ratio (PE) based on Growth Rate, Profit Margin, and whether or not the firm is Green (1 = Yes, 0 = No). -At α = 0.05, we can conclude that

Use the following to answer the question(s) below. Stock prices and earnings per share (EPS) data were collected for a sample of 15 companies. Below are the regression results. The dependent variable is Stock Price. -What is the correlation between stock price and EPS?

The model = 12 + 20 Diameter can be used to predict the breaking strength of a rope (in kilograms) from its diameter (in centimetres). According to this model, how much force should a rope one-half centimeter in diameter withstand?

Use the following to answer the question(s) below. A newly developed drug is tested to determine absorption levels in a patient's bloodstream. A patient is injected with the drug and the concentration (units/cc) in the patient's blood is measured every hour for seven hours. Below is the output from fitting a linear regression model. -Which of the following is true?

Use the following to answer the question(s) below. A large pharmaceutical company selected a random sample of new hires and obtained their job performance ratings based on their first six months with the company. These data were used to build a multiple regression model to predict the job performance of new hires based on age, GPA and gender (female = 1 and male = 0). The results of the analysis are shown below. -Which of the following is the correct interpretation for the regression coefficient of Gender?

Use the following to answer the question(s) below. For many countries tourism is an important source of revenue. Data are collected on the number of foreign visitors to a country (in millions) and total tourism revenue (in billions of dollars) for a sample of 10 countries. Below is the regression analysis output with tourism revenue as the dependent variable. -If we were interested in predicting the tourism revenue for a particular country that had 30 million foreign visitors

The model = 3.30 + 0.235 Speed can be used to predict the stopping distance (in metres) for a car traveling at a specific speed (in kph). According to this model, about how much distance will a car going 65 kph need to stop?

The Durbin-Watson statistic indicates

Use the following to answer the question(s) below. Weekly commodity prices for heating oil (in cents) were obtained and regressed against time. Below is the regression output and residual plots from fitting a linear model. -Which of the following statement is true?

Use the following to answer the questions below. The following is output from regression analysis performed to develop a model for predicting a firm's Price-Earnings Ratio (PE) based on Growth Rate, Profit Margin, and whether or not the firm is Green (1 = Yes, 0 = No). -Based on the F-statistic and associated P-value, we can conclude at α = 0.05 that

Which of the following is not true about the best regression models?

A least squares estimated regression line has been fitted to a set of data and the resulting residual plot is shown. Which is true?

The residual plot for a linear regression model is shown below. Which of the following is true?

Which statement about residuals plot is true?

Use the following to answer the question(s) below. Data were collected for a sample of 12 pharmacists to determine if years of experience and salary are related. Below are the regression analysis results. The dependent variable is Salary in thousands of dollars. -The standard error of the slope for this estimated regression equation is

Use the following to answer the questions below. The following is output from regression analysis performed to develop a model for predicting a firm's Price-Earnings Ratio (PE) based on Growth Rate, Profit Margin, and whether or not the firm is Green (1 = Yes, 0 = No). -Which of the following is the correct interpretation for the regression coefficient of Green?

Use the following to answer the question(s) below. A large pharmaceutical company selected a random sample of new hires and obtained their job performance ratings based on their first six months with the company. These data were used to build a multiple regression model to predict the job performance of new hires based on age, GPA and gender (female = 1 and male = 0). The results of the analysis are shown below. -At α = 0.05, we can conclude that

Which statement about re-expressing data is true?

Using the estimated regression equation to predict salary for 10 years of experience gives the following results. Which of the following is true?