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Homework Help: Temperature Change

  1. Jun 21, 2009 #1
    1. The problem statement, all variables and given/known data

    The following table shows the daily high tem-
    peratures for a week in May. Determine the
    change in temperature each day.

    Sun. 76◦
    Mon. 72◦
    Tues. 80◦
    Wed. 75◦
    Thurs. 75◦
    Fri. 74◦
    Sat. 78◦

    Find the net change in temperature (the
    sum of all the temperature changes).

    2. Relevant equations


    3. The attempt at a solution

    I know this seems easy, but I'm not getting the right answer:

    Sun. to Mon. = -4 degrees
    Mon to Tues. = 8 degrees
    Tues. to Wed. = -5 degrees
    Wed. to Thurs. = 0 degree
    Thurs. to Fri. = -1 degree
    Fri. to Sat. = 4 degrees
    Sat. to Sun. = -2 degrees

    Added them up and got: 0 degree

    Am I suppose to just add up the absolute value of the temperature changes?
  2. jcsd
  3. Jun 21, 2009 #2


    User Avatar
    Staff Emeritus
    Science Advisor

    Wouldn't the net change be the temperature on the final day - temperature on the first day, i.e. 2 deg F.

    Or if one did a least squares fit to trend the data, and then take the final difference or the sum of the differences to the tread line.

    Does the net temperature change = the sum of all the temperature changes?
  4. Jun 21, 2009 #3
    The Saturday to Sunday change shouldn't be included I don't thing.
  5. Jun 21, 2009 #4
    2 degrees is right thank you!
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