Answered step by step
Verified Expert Solution
Link Copied!

Question

1 Approved Answer

Please answer the following question with the help of R Studio. Q2. Table 1 summarizes the results of a linear regression model using a subset

Please answer the following question with the help of R Studio.

image text in transcribedimage text in transcribed
Q2. Table 1 summarizes the results of a linear regression model using a subset of the "mtcars" data. The goal is to analyze fuel efficiency (mpg) using two independent variables "wt" (weight) and "cyl" (number of cylinders). The "cyl" is a categorical variable with three levels: "4", "6" and "8" and can be recoded using two dummy variables D2 and D3. mpg = Bo + B,*wt + B2*D2 + B,*D3 + , u is IID N(0, o') mpg : miles per gallon wt : weight (measured in 1000 lbs) D2 : the number of cylinders is six (D2 = 1 when cyl = 6, D2 = 0 when cyl # 6) D3 : the number of cylinders is eight (D3 = 1 when cyl = 8, D3 = 0 when cyl # 8) Table 1 Coefficients: Estimate Std. Error t value Pr(> |t[) (Intercept) 33.6445 2.1116 15.933 1.33e-14 *#* wt -3.1258 0.8219 3.803 0.00082 *** cyl (= 6) -4.1918 1.6093 [ A ] B cyl (= 8) -6.0436 1.7505 -3.452 0.00199 **Signif. codes: ( **0.001 * 0.01 0.05 0.1 "1 Residual standard error: 2.682 on 25 degrees of freedom Multiple R-squared: 0.8227, Adjusted R-squared: [ C ] F-statistic: [ D ], p-value: [ E ] a) Please fill in cell A, B, C, D, and E. Present your computational process in details; you also need to provide the corresponding R codes for both cell B and E b) What is the respective meaning of the estimated coefficients "-4.19" and "-6.04" for both dummy variables D2 and D3? c) What is the purpose of the F statistic (i.e., cell D) presented at the bottom of the table? Based on the corresponding p-value (i.e., cell E), what can you conclude? d) What is the predicted mpg for a 4-cylinder car with 2 units (2000 lbs) of weight? Present the computation process and the predicted mpg. e) Suppose the ordering of the "cyl" is rearranged in the linear regression model as shown in Table 2, please fill in cell F, G and H and show you how to get these numerical values? Table 2 Estimate mpg = Bo + Bi*wt + 2*D2 + B*D3 + (Intercept) IF D2: the number of cylinders is four wt -3.1258 D3: the number of cylinders is eight CYL( = 4) G CYL( = 8) H What are new estimated Bo, B2, and By

Step by Step Solution

There are 3 Steps involved in it

Step: 1

blur-text-image

Get Instant Access to Expert-Tailored Solutions

See step-by-step solutions with expert insights and AI powered tools for academic success

Step: 2

blur-text-image

Step: 3

blur-text-image

Ace Your Homework with AI

Get the answers you need in no time with our AI-driven, step-by-step assistance

Get Started

Recommended Textbook for

Intermediate Algebra Functions & Authentic Applications (Subscription)

Authors: Jay Lehmann

6th Edition

0134779487, 9780134779485

More Books

Students also viewed these Mathematics questions

Question

Explain relationships between intentional and negligent torts.

Answered: 1 week ago

Question

1. To understand how to set goals in a communication process

Answered: 1 week ago