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1.2 The following data indicates the percentage of the class actually working at their maths at different times one hot Frida

(b) Construct a scatterplot and determine whether a likely relationship exists between the time since start of lesson (x) and

(c) Draw the regression line on the scatter plot (even if it is a poor it to the data). Show your calculations to determine t

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Answer #1

XY 20 time since start of percentage lesson of class (minutes)(x) working(y) X^2 5 10 30 15 50 20 85 25 75 30 70 35 40 40 10

y = at bu b=NE DEN² - (En)2 Neny -Eney. b = = 8 (8625) - (180) (380) 8 (5100) - (180) = 0.071428 b xoo - g - b { y_b En N * Snuwch i (1) Band 100 90 (N. 0.80 (02, 21) 70 60 50 40 30 20 10 NO3)(3) - pirs o 5. 10 15 20 25 30 35 40 Thore is no relations© line u drawn 00 OP (15,50) (10.45) 12-ni OF 00 -50-45 15-10 10 r = UN ZE DE 2 for neny -(En)(sy) COSA? -Ew?) (n ey?. Ey)? l

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