Posted this before and it was answered incorrectly PLEASE ONLY ATTEMPT IF YOU KN

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Posted this before and it was answered incorrectly PLEASE ONLY ATTEMPT IF YOU KNOW HOW TO ANSWER THIS QUESTION

SHOW ALL PARTS. Use R-studio if possible please

Question 16 Your answer is INCORRECT This is a written question, worth 14 points. DO NOT place the problem code on the answer sheet. A proctor will fill this out after exam submission. Show all steps (work) on your answer sheet for full credit. Problem Code: 1653 The following data are for intelligence-test (IT) scores, reading rates (RR), and grade-point averages (GPA) of 8 at-risk students IT 155 171 210 198 172 183 182 169 RR 46 33 39 24 30 36 46 23 GPA 3.0 2.2 2.4 15 1.9 2.4 29 1.3 Part a: Calculate the line of best fit that predicts the GPA on the basis of RR scores. Part b: Calculate the line of best fit that predicts the GPA on the basis of IT scores Part c: Which of the two lines calculated in parts a and b best fits the data? a) I have placed my work and my answer on my answer sheet. b) I want to have points deducted from my test for not working this problem.

Explanation / Answer

a)

The line of best fit that predicts the GPA on the basis of RR scores is

GPA = - 0.153 + 0.0680 RR

Predictor Coef SE Coef T P
Constant -0.1528 0.1409 -1.08 0.320
RR 0.067950 0.003958 17.17 0.000

S = 0.0929773 R-Sq = 98.0% R-Sq(adj) = 97.7%

b)

The line of best fit that predicts the GPA on the basis of IT scores is
GPA = 3.24 0- 0.0058 IT

Predictor Coef SE Coef T P
Constant 3.240 2.544 1.27 0.250
IT -0.0059 0.0141 -0.41 0.696

S = 0.649218 R-Sq = 2.7% R-Sq(adj) = 0.0%

c) The line GPA = - 0.153 + 0.0680 RR calculated in part a) is best fit the data because the information explained by RR for GPA is  98.0% whereas IT explained 2.7% in the mode b) for  GPA.

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