Residual Model DiagnosticsNormal Plot of ResidualsIChart of Residuals20401530102010-1020-15-20-3040-11020Normal ScoreObservation NumberHstogram of ResidualsResiduals vs. Fits201510-10-15202520-101020405060708090ResidualFita)Interpret the given output.b) Test for the Lack-of-Fit.c)Find and interpret a 95% confidence interval for the y-intercept.TResidualFrequencyTTT TTTT TResidualResidual

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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Statistics students in Oxnard College sampled 10 textbooks in the Condor bookstore, and recorded the number of pages in each textbook and its cost. The bivariate data is shown below, Number of Pages (x) Cost(y) 864 117.68 621 92.52 832 125.84 885 120.2 955 132.6 422 71.64 937 138.44 939 127.68 889 115.68 220 46.4 A student calculates a linear modely= __?__ x + __?__ . (Please show your answers to two decimal places) Use the model above to estimate the cost when number of pages is 320 Cost = $ __?__. (Please show your answer to 2 decimal places.)
28)
In regression, what is the difference between an observed value of the response variable and its predicted value called? Choose the correct answer below. R2 A standard error A residual A mean square error Leverage
Gender and Frequency of Status Updates on Facebook The Pew Research Center conducted a survey of randomly sampled American adults, asking them about their use of social networking sites such as Facebook. The table below shows the self-reported frequency of status updates on Facebook by gender. Are frequency of status updates and gender related? chi-square statistic = i p-value = i Conclusion: ĮStatus/Gender Ho- Every day 3 - 5 days/week 1 - 2 days/week Every few weeks Less often Total Male Female Total 42 46 70 77 88 386 59 79 79 151 186 491 130 105 149 Round your answer for the chi-square statistic to one decimal place, and your answer for the p-value to three decimal places. 156 337 877 Table 1 Gender and frequency of status updates on Facebook
What is a residual for a multiple regression model and the data that is used to create it? Select one. A statistic that is used to evaluate the significance of the multiple regression model A statistic that explains the relationship between response and predictor variables The predicted value of the response variable using the multiple regression model The difference between the actual value of the response variable and the corresponding predicted value (regression error) using the multiple regression model
Analysis of Variance results: Where: Age > 5Responses: AgeFactors: Sex Response statistics by factor Sex n Mean Std. Dev. Std. Error female 121 10.490083 4.2222704 0.38384277 male 155 9.0806452 3.0091656 0.241702 ANOVA table Source DF SS MS F-Stat P-value Sex 1 134.98939 134.98939 10.466692 0.0014 Error 274 3533.79 12.897044 Total 275 3668.7794 Tukey HSD results (95% level) female subtracted from Difference Lower Upper P-value male -1.4094375 -2.2670907 -0.55178425 0.0014 In one complete sentence, interpret your confidence interval. Make sure in the interpretation it is clear the direction of the difference (i.e. which gender weighs more and by how much. Explain why a confidence interval provides more information to a tiger researcher than the results of a hypothesis test
Statistics students in Oxnard College sampled 9 textbooks in the Condor bookstore and recorded the number of pages in each textbook and its cost. The bivariate data are shown below: Number of Pages (xx) Cost(yy) 726 35.3 737 45.85 355 24.75 255 14.75 754 34.7 797 49.85 898 59.9 424 18.2 391 31.55 A student calculates a linear modelyy = Incorrect xx + . (Please show your answers to two decimal places)Use the model to estimate the cost when number of pages is 777.Cost = $ (Please show your answer to 2 decimal places.)
Using positional statistics describe the structure of the monthly turnover of 80 shops [in thousand PLN]Calculate and interpret: median, quartiles, deciles, quartile deviation, positional coefficient of variation, positional coefficient of asymmetry, and positional coefficient of concentration. Perform all calculations for the following data type: interval grouped data. 51 27 51 59 29 24 44 42 47 24 76 73 68 41 49 47 48 54 49 66 35 34 18 51 62 45 55 43 71 37 52 60 34 67 58 55 69 61 62 60 47 51 75 41 48 26 26 62 55 34 26 67 52 47 34 51 67 57 57 58 51 57 57 55 41 53 48 14 49 79 46 69 72 75 26 59 44 69 69 68
Model Summary Adjusted R Square Std. Error of Model R R Square the Estimate 1 .772 .596 .516 215.1509 a. Predictors: (Constant), Porosity ANOVA Sum of Model Squares df Mean Square F Sig. Regression 341943.282 1 341943.282 7.387 .042b Residual 231449.575 46289.915 Total 573392.857 a. Dependent Variable: Runoff b. Predictors: (Constant), Porosity Coefficients Standardized Unstandardized Coefficients Coefficients Model B Std. Error Beta t Sig. (Constant) 1863.761 237.546 7.846 .001 Porosity -80.729 29.703 -.772 -2.718 .042 a. Dependent Variable: Runoff A geomorphologist is building a model to understand variation in the amount of runoff observed in various streams within a large drainage basin. Linear regression is used to determine whether runoff is inversely related to the porosity of the soil. The variables here are thus runoff and porosity. The SPSS output from the analysis is shown above. One of the cases has a runoff value of 900 and a porosity value of 8. Calculate the value of the…
Using results from the regression model, discuss whether you would have confidence in this multiple regression model to predict expected salary based on GPA, age, and gender?
Stocks and Sunspots. Listed below are annual high values of the Dow Jones Industrial Average (DJIA) and annual mean sunspot numbers for eight recent years. Use the data for Exercises 1–5. A sunspot number is a measure of sunspots or groups of sunspots on the surface of the sun. The DJIA is a commonly used index that is a weighted mean calculated from different stock values. Correlation Use a 0.05 significance level to test for a linear correlation between the DJIA values and the sunspot numbers. Is the result as you expected? Should anyone consider investing in stocks based on sunspot numbers?
What is a residual for a multiple regression model and the data that is used to create it? Select one. Question 3 options: A statistic that explains the relationship between response and predictor variables The predicted value of the response variable using the multiple regression model A statistic that is used to evaluate the significance of the multiple regression model The difference between the actual value of the response variable and the corresponding predicted value (regression error) using the multiple regression model

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