A math professor selects 8 students at random from her calculus class and asks them to recordtheir study times. After two weeks, she gives an exam. the number of hours, x, of study time andthe test score, y, yield the following sample data summary:Ex = 117Ey = 6608%3|n 3=Ea2 = 1869546389519The professor is a bit surprised.a) Find the equation of the regression line.b) Use the regression line to predict the score of a student who studies for 20 hours over the twoweeks.

Find Regression line equations from ∑x = 117, ∑y = 660, ∑x2 = 1869, ∑y2 = 54638, ∑xy = 9519, n = 8,…

Answered: A math professor selects 8 students at…

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 regression equation is: ŷ = 67.16 + 8.417x where ŷ is the miles traveled, and x is the MPG. The sample size used was all 110 MPG records. The correlation coefficient r = 0.620. Use the information to obtain an estimate of my mileage if my MPG is 22. Is it option: a.) cannot estimate ŷ rcrit = 0.195; the correlation IS NOT significant b.) ŷ = 252.33 rcrit = 0.195; the correlation IS significant c.) ŷ = 252.33 rcrit = 0.187; the correlation IS significant d.) cannot estimate ŷ rcrit = 0.187; the correlation IS NOT significant
The following table contains data regarding golf scores and the average lengths of drives (in yards) for a sample of five golfers. Golf Scores and Average Drive Lengths Golf Scores, x 78 77 74 71 71 Length of Drive (in Yards), y 220 225 233 262 268 Copy Data Step 1 of 2: Calculate the sum of squared errors, SSE, based on a regression analysis of the golf data. Round your answer to two decimal places, if necessary.
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Find the GPA of a student if he gives average hours to study by using regression analysis. A random sample of ten students is selected from a class of 60 students, find regression line and also find the GPA of a student if he gives average hours to study by using this regression analysis. Their GPA and the hours to study are given below: GPA 2.5 3.1 3.6 3.2 2.9 3.7 2.9 2.4 3.3 3.5 Hours to study 3 5 7 5 3 8 4 2 5 7 Also interpret the regression coefficient.
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n order for applicants to work for the foreign-service department, they must take a test in the language of the country where they plan to work. The data below shows the relationship between the number of years that applicants have studied a particular language and the grades they received on the proficiency exam. Find the equation of the regression line for the data. given Number of years, x 4 5 3 6 2 7 3 Grades on test, y 61 68 75 82 73 90 58 93 72 O A. y 6.910x+46.261 O B. -46.261x +6.910 O C. =6.910x-46.261 O D. = 46.261x-6.910 Next Time Remaining: 01:02:25 74°F Mostly 五 TTL
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