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CategoryMath
SubjectStatistics
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Statistics homework for r studio. Questions submitted below in photos

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AT&T < Math 552 (7521), Spring 2018 PDF HW_VII.pdf abline (a=beta0,b=beta1) drive.google.com 1:13 PM HW_VII.pdf - Google Drive 3. Draw the regression line on the scatter plot in the part (1) by using the following command: where beta0 and betal are the calculated estimates from part (2). Do you think the fit of the linear regression line is reasonable? 4. What are the interpretations of Bo and B₁? Now for further inferences, let us use the "lm" command in R-Studio. 5. Let us test whether the B₁ is meaningful in this model under 0.01 significance level. (a) State the hypotheses. (b) What is the test statistic and p-value from the "lm" result. (c) Conclude and interpret your result. 6. Obtain the 90% confidence interval for ₁ by using "confint" command. Interpret the interval result. 7. Suppose we can reasonably expect the RPPG of Guinea Pigs is 0.98. Then, what is the predicted winning percentage of Guinea Pigs? In addition, what is the 90% prediction interval of winning percentage of guinea pigs? (Use "predict" command) Interpret this prediction interval. New Order Now, instead of using RPPG, let us use a model as follows: Bo + ₁ x PPG + ₂ × OPPG+ € 8. What is the coefficient of determination, R²2, of this model? What is the meaning of the value? = Page Winning Percentage This is an example of multiple linear regression model and the result can be obtained by the following commands: fit<-lm (Win_P~PPG+OPPG) ; summary (fit) 9. Are those regression coefficients ₁ and 3₂ meaningful in this model? 10. What is the coefficient determination, R², of this model? Is this very different from the R² in part (8)? Based on this observation, do you think RPPG was a effective combination of PPG and OPPG? + / 3 3 3 71% Sign In

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AT&T < Math 552 (7521), Spring 2018 PDF HW_VII.pdf 1:13 PM drive.google.com 3. Find out the correlations between x; and y; for i = 1, 2, 3, 4. (Round off to three decimal places.) HW_VII.pdf - Google Drive 4. Find out the linear regression lines based on xi and Yi for i=1, 2, 3, 4. (Round off to two decimal places.) 5. Lastly, visualize four scatter plots of Xi and yi linear regression lines. Variable Team W L Win P 6. What is the implication of the result from this Anscombe's data? Briefly write down your finding. Description Team Name # of Win # of Loss Problem #1. The following is the variable descriptions of NBA 2017-2018 regular season data. Winning Percentage = # of Win / # of Game for i Variable GB PPG OPPG SRS Playoff Bo = Y – BLX; Bị In our class, we predicted the winning percentage (Win_P) of our new team, Columbia Guinea Pigs, by defining a new explanatory variable EPPG (PPG-EPPG). In this question, let us define a similar measure, RPPG=PPG/OPPG which also reflects the both defensive and offensive strengths of each team and use this for the prediction. The data can be obtained by the following commands: 1, 2, 3, 4 super-imposed by their download.file("http://people.stat.sc.edu/taeho/teaching/lab/NBA.RData", destfile = "NBA.RData"); load ("NBA. RData"); attach (NBA) = = 1. Plot a scatter plot between the Winning Percentage and RPPG. From the visual ob- servation, do you think a “linear” regression based on RPPG is an appropriate model to predict winning percentage? 2. Suppose we decide to use the following model: Winning Percentage = New Order Description Games Behind Points per Game Opponent Points per Game Simple Rating System Playoff Team The intercept and slope parameters can be estimated by the least square estimators as follows: Bo + ₁ x RPPG + € Σ₁ (Xi - X)(Yi – Y) Σ₁₁(X₂ – X)² Page 2 / 3 where Y Winning Percentage and X RPPG under our setting. Please find out the values of least square estimators Bo and ₁ without using the command "Im". That is, we can only use basic commands "mean", "sum", and etc. in R-Studio to calculate the two estimates. + 71% Sign In

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AT&T < Math 552 (7521), Spring 2018 PDF HW_VII.pdf 1:13 PM drive.google.com HW_VII.pdf - Google Drive Homework VII STAT 509: Statistics for Engineers April 22, 2018 Include all R code and output for the questions. Do not just "write in" the R code you used. Also, do not just write the answer and say this is what R gave you. I want to see your code and your answers accompanying your code. Problem #1. The following is Anscombe's data which contains four sets of explanatory and response variables. Set II Set III Set IV Y4 6.58 5.76 7.71 X2 Y2 X3 Y3 X4 10 9.14 10 7.46 8 8 8.14 8 6.77 8 8.74 13 12.74 8 8.77 9 11 8.1 14 6.13 6 3.1 4 7.11 8 8.84 7.81 8 8.47 8.84 8 7.04 6.08 8 5.25 5.39 19 12.5 9.13 12 8.15 8 5.56 7.26 7 6.42 8 7.91 4.74 5 5.73 8 6.89 Set I X1 Y1 10 8.04 6.95 7.58 13 8 13 9 8.81 9 11 8.33 14 11 9.26 9.96 14 7.24 6 4.26 4 6 10.84 12 4 12 7 5 5.68 5 4.82 7 The data can be obtained by the following commands: Please answer the following questions by using any commands of R-Studio. 1. Find out the sample means of x; and y, respectively for i = 1, 2, 3, 4. (Round off to two decimal places.) download.file("http://people.stat.sc.edu/taeho/teaching/lab/Anscombe. RData", destfile = "Anscombe. RData"); load("Anscombe. RData"); attach (Anscombe) 2. Find out the sample variances of x; and y; respectively for i = 1, 2, 3, 4. (Round off to three decimal places.) New Order 1 + Page 1 / 3 71% Sign In

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