(d) If the life expectancy is increased by 1.5 years in a certain country, how much will the happinessindex change? Round to two decimal places.(e) Use the regression line to predict the happiness index of a country with a life expectancy of 62years. Round to two decimal places.Use the space below to type your answer AND/OR to upload a picture of your work for all thequestions in this problem.To upload a picture of your work, use a cellphone camera or a free scanning app (such as Adobe Scan, Simple Scanner,Tiny Scan, ..), download the picture or document to your own computer via email, and attach your document using the"attach file" sign (paper clip symbol) on the menu bar below. Please do not use "insert/edit image" (picture sign) to uploadyour file.Edit -Insert -FormatsIU X,<>田。 To earn full credit for this question, use your own sheet of paper to solve the problem, showing all steps ofyour work.A regression was run to determine if there is a relationship between the happiness index (y) and lifeexpectancy in years of a given country (x).The results of the regression were:ŷ=a+bxa=-1.02b=0.163(a) Write the equation of the Least Squares Regression line of the form(b) Which is a possible value for the correlation coefficient, r?O-0.641O 0.641O-1.04O1.04(c) If a country increases its life expectancy, the happiness index willO decreaseO increase

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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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Suppose Tatiyana is interested in the relationship between language ability and time spent reading. She randomly selects a sample of 30 students from the local high school and collects their scores from a language aptitude test. She surveys the sample asking each student how many hours per month he or she spends reading. Using the sample data, Tatiyana produces a scatterplot with reading time on the horizontal axis and language test scores on the vertical axis. She develops a least squares regression equation where ? is the amount of time spent reading during the month and ?̂ is the predicted value of the language test score. ?̂=3.251x+31.237 Compute the value of ?̂ when a student spends 42 hours reading. Give your answer precise to one decimal place. Avoid rounding until the last step. ?̂= ? points Identify all of the true statements regarding the interpretation of ?̂ when ?=42. The value of ?̂ is ? a. the predicted number of students that read for 42 hours. b. the language test…
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st e this 1:33 38% K A pediatrician wants to determine the relation that exists between a child's height, x, and head circumference, y. She randomly selects 11 children from her practice, measures their heights and head circumferences, and obtains the accompanying data. Complete parts (a) through (g) below. Click the icon to view the children's data. (a) Find the least-squares regression line treating height as the explanatory variable and head circumference as the response variable. Data Table y = X + (Round the slope to three decimal places and round the constant to one decimal place as needed.) View an example Height (inches), X Head Circumference (inches), y D 27.75 17.8 24.75 17.3 25.75 17.4 26.25 17.7 25 17.1 28.25 17.9 26.75 17.5 27 17.7 26 26 27.5 ||| = Print Get more help. (...) 17.5 17.7 17.8 1 LTE2 + ... Done O X Clear all Check answer

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