Question 4.including 122 countries by regressing "lifeexpf" onto “docs". The variables included are:The following regression results are drawn from a UN data setlifeexpf: female life expectancy in years [i.e., the average for all females in each country]docs: number of doctors per 10,000 of the population.Regression Analysis: lifeexpf versus docsThe regression equation islifeexpf - 58.2 + 0.783 docsPredictorCoef SE CoefTP58.24700.783240.000Constantdocs0.881166.100.0577213.57 0.000S =R-Sq = 60.7%R-Sq (adj) = 60.4%Analysis of VarianceSourceDFsMSFP184.14RegressionResidual Error19082.79082.71195869.5Total12014952.2Please answer the following questions:a) Interpret the impact of docs on lifeexpf.b) Test whether the model can be used for predicting female life expectancy in a country[use a 95% confidence level] and show your work.c) Does the graph below [a plot of the residuals against fitted values] seem to contradictthe answer to part b)? Please explain why or why not.Residuals Versus the Fitted Values(response is lifeexpf)20-10--10--20-6065707580859095Fitted ValueResidual

The estimated regression equation is given as Lifeexpf= 58.2 + 0.783 docs

Answered: a) Interpret the impact of docs on…

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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The design of controls and instruments affects how easily people can use them. A student project investigated this effect by asking 25 right handed students to turn a knob with their right hands that moved an indicator by screw action. There were two identical instruments, one with a right-hand thread and the other with a left-hand thread. The table given has the data from the student project.1. Calculate and interpret a 90% confidence interval for the mean time advantage of right hand over left hand threads in the setting above.
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