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Very probability and stats question.

  1. Mar 4, 2008 #1
    Very urgent probability and stats question.

    1. The problem statement, all variables and given/known data

    Hi

    I have the following problems.

    During an investigation of polution in a river scientistists have taken 60 water samples in the river
    and measured the concentration c of bacteria. They have taken 20 samples in a distance of 0 meters
    from land, 20 samples at a distance of 15 meters from land and 20 samples at a distance of 30
    meters from land. This gives 3 rows of observations with 20 obs in each. The 3 sets of observations
    are normaldistributed.
    1) Show that the can be assusmed that all 3 rows of observations have the same variance.
    2) Show that it can be assumed that the mean value of the concentration of bacteria is lineary
    dependent by the distance from land.
    3) Show that measurements gives grounds to assume that concentration of bacteria is
    dependent of the distance from land.
    4) Write the final probility measure. Give the 95% confidens level, and the slope of the
    regression line.

    with the data
    Code (Text):

    Obs konc drain dist
    1 2.15 250 0
    2 2.54 250 0
    3 2.15 250 0
    4 2.11 250 0
    5 1.90 250 0
    6 2.40 250 0
    7 2.23 250 0
    8 2.54 250 0
    9 2.11 250 0
    10 2.04 250 0
    11 1.90 1300 0
    12 2.40 1300 0
    13 2.40 1300 0
    14 1.85 1300 0
    15 2.54 1300 0
    16 2.11 1300 0
    17 2.04 1300 0
    18 1.90 1300 0
    19 2.11 1300 0
    20 2.40 1300 0
    21 1.90 250 15
    22 2.54 250 15
    23 2.11 250 15
    24 1.90 250 15
    25 2.11 250 15
    26 1.70 250 15
    27 2.23 250 15
    28 2.11 250 15
    29 1.70 250 15
    30 2.11 250 15
    31 2.11 1300 15
    32 1.90 1300 15
    33 2.11 1300 15
    34 2.40 1300 15
    35 2.11 1300 15
    36 1.70 1300 15
    37 1.90 1300 15
    38 2.11 1300 15
    39 2.15 1300 15
    40 2.23 1300 15
    41 2.11 250 30
    42 2.04 250 30
    43 1.90 250 30
    44 2.11 250 30
    45 2.15 250 30
    46 1.54 250 30
    47 1.85 250 30
    48 1.54 250 30
    49 1.95 250 30
    50 1.90 250 30
    51 2.11 1300 30
    52 1.70 1300 30
    53 2.23 1300 30
    54 2.11 1300 30
    55 1.70 1300 30
    56 2.54 1300 30
    57 1.85 1300 30
    58 1.70 1300 30
    59 2.11 1300 30
    60 1.90 1300 30
     
    I hope tha there is someone with the skills who can solve this for me, because going to hospital tomorrow to have a cyst in my stomac removed, and therefore I need to have dine done within the next 3-6 hours.

    I know this much to ask, but there is someone I am willing to disposite money into a paypale account as payment.

    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
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