MATH 2328 Spring 2018 EXAM 1 The Least Square regression line is added to the sc

Question

MATH 2328 Spring 2018 EXAM 1 The Least Square regression line is added to the scatterplot ath 2228 5tudents Survey 20 100 d. Use formulas to calculate the slope b and intercept a of the linear regression. Show all work. Write the equation of linear regression in the form Y-a+bx in the box provided e. What meaning (if any) does the y intercept a have in this situation? f. What meaning (if any) does the slope b have in this situation? 8. Predict the number of left hand snaps for student who can do 60 snaps per minute with the right hand What percent of variation in number of left hand snaps could be explained by this model? ls given regression model reliable? h.

Explanation / Answer

There must be some more data to the solve this problem in a proper manner or a more clear picture. But, I will try my best to answer the question with the graph that I can see.

There are no a, b and c part asked in the question. The picture that you have uploaded asks from d.

(d). since line passes from the origin, thus a = 0. Line at X=125 has height almost equal to 120 thus b = 120/125

(e) In this situation a = 0, thus Y intercept has no meaning but in general, Y-intercept tells you about the number of output units even when input is equal to zero

(f) Slope represents the change in Y with respect to change in X.

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