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25 October, 14:30

Question 1) In a random sample of 10 on-line statistics students, information was collected about their minutes studied and their chapter test scores. X is the minutes studied, and Y is the test score.

x : {20,30,45,60,80,90,45,120,90,70} y: {50,45,55,70,80,90,80,100,95,85}

Is this relationship positive, negative or no relation? Answer: (positive)

Using the data from question #1, what is the equation of the line of best fit? (For future reference: line of best fit, linear regression equation, and least-squares line are all the same thing y=ax+b). Round your answers to the nearest tenth. x : {20,30,45,60,80,90,45,120,90,70} y: {50,45,55,70,80,90,80,100,95,85}

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Answers (1)
  1. 25 October, 17:43
    0
    First, arrange the data in a table for easy reference:

    x y

    20 50

    30 45

    45 55

    60 70

    80 80

    90 90

    45 80

    120 100

    90 95

    70 85

    Then, use the calculator to find the relationship of the two variables, x (minutes studied) and y (test scores)

    The equation is

    y = 0.56686x + 38.15
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