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Math Help - what the slope tells us

  1. #1
    Member Mr Rayon's Avatar
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    what the slope tells us

    For a sampel of males, it is found that the least squares regression line connecting their weight w kg and their height h cm is given by w = 0.9h - 80. What is the slope of the regression line and what does it represent?

    A) The slope is 0.9. It tells us for each 1 kg increase in weight, the expected increast in height is 0.9 cm.

    B) The slope is 0.9. It tells us that for each 1 cm increase in height, the expected increase in weight is 0.9 kg.

    C) The slope is 0.9. It tells us that for each 0.9 increase in weight, the expected increase in height is 1 cm

    D) The slope is 0.9. It tells us that for each 0.9 cm increase in heith, the expected increase in weight is 1 kg.

    E) The slope is -80. It tells us that for each 80 cm increase in height, the expected increase in weight is 0.9 kg.

    I think B is the answer. Could somebody please confirm or elaborate details if I am wrong?
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by Mr Rayon View Post
    For a sampel of males, it is found that the least squares regression line connecting their weight w kg and their height h cm is given by w = 0.9h - 80. What is the slope of the regression line and what does it represent?

    A) The slope is 0.9. It tells us for each 1 kg increase in weight, the expected increast in height is 0.9 cm.

    B) The slope is 0.9. It tells us that for each 1 cm increase in height, the expected increase in weight is 0.9 kg.

    C) The slope is 0.9. It tells us that for each 0.9 increase in weight, the expected increase in height is 1 cm

    D) The slope is 0.9. It tells us that for each 0.9 cm increase in heith, the expected increase in weight is 1 kg.

    E) The slope is -80. It tells us that for each 80 cm increase in height, the expected increase in weight is 0.9 kg.

    I think B is the answer. Could somebody please confirm or elaborate details if I am wrong?
    Yes, it is B

    CB
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