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maths coursework- ocr higher tier- stats- estimate. HLP!!!! :trytofly:

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    :confused: :confused: :confused: PLS CAN ANY1 HELP IF THEVE ALREDY DONE DA FOLLOWIN COURSEWRK?
    ESTIMATE

    Brian asked 120 people to estimate the area of a rectangle

    These are the estimates people gave to Brian for the area of the rectangle.


    All measurements are in square centimetres.

    90.5 140.6 180 151.55 112 129.7
    100 134.6 168.3 201.3 146.4 132
    189 152.25 126.3 141.3 165 147.4
    170 188 136.2 144.8 139 126
    41.2 100 129 156.2 146.8 146.9
    141 111 134.8 155.5 183 157
    157.7 161.5 144 119.1 125 125
    130 132.2 147.9 151.6 159 154.2
    122 129 139.5 146 132 133.7
    146.6 155 146.8 158.9 165.3 119
    143 121.25 115 166 183 108.2
    155.8 149 148.2 146.3 175.9 157.3
    118 170 138 129 148.5 166
    169.3 137.1 142.6 134.2 93 167.4
    111.3 147.3 160 141.8 177 100
    139 177.4 184 140 146.2 131.8
    135.5 135.5 145 175 250 122
    166.2 138 135.8 160 151 133
    95 145.4 190 162.6 140 125
    147.8 149.5 164 137.4 121.1 169


    The area of the rectangle is 145.36cm2

    1. Which estimate was closest to the correct answer? 145.4

    2. What was the mean estimate? 144.5613

    3. Use the data to decide how good at estimating areas these people are

    4. Extend your investigation, making clear rules and methods that you use.


    I must analyse the estimates that were made for the area of this rectangle. How?????????? i no i must find averages, put em in tables etc.

    I know wat i mst do for extention
    but were i have to analyse da above how am i suppose to find da mean and median values when i have grouped dem???

    this is how ive grouped em:


    estimates frequency
    0-50 1
    50-100 3
    100-150 73
    150-180 34
    180-210 8
    210-250 1


    dis is da data wen ordered
    41.2
    90.5
    93
    95
    100
    100
    100
    108.2
    111
    111.3
    112
    115
    118
    119
    119.1
    121.2
    121.25
    122
    122
    125
    125
    125
    126
    126.3
    129
    129
    129
    129.7
    130
    131.8
    132
    132
    132.2
    133
    133.7
    134.2
    134.6
    134.8
    135.5
    135.5
    135.8
    136.2
    137.1
    137.4
    138
    138
    139
    139
    139.5
    140
    140
    140.6
    141
    141.3
    141.8
    142.6
    143
    144
    144.8
    145
    145.4
    146
    146.2
    146.3
    146.4
    146.6
    146.8
    146.8
    146.9
    147.3
    147.4
    147.8
    147.9
    148.2
    148.5
    149
    149.5
    151
    151.55
    151.6
    152.25
    154.2
    155
    155.5
    155.8
    156.2
    157
    157.3
    157.7
    158.9
    159
    160
    160
    161.5
    162.6
    164
    165
    165.3
    166
    166
    166.2
    167.4
    168.3
    169
    169.3
    170
    170
    175
    175.9
    177
    177.4
    180
    183
    183
    184
    188
    189
    190
    201.3
    250
    total =17347.35
    mean= 144.5613
    mode=
    median=145.2 (60.5th valu)
    range=208.8

    thanx - if ne 1 cud hlp me id greatly appreciate it!!!
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    (Original post by Sparrohawk)
    :confused: :confused: :confused: PLS CAN ANY1 HELP IF THEVE ALREDY DONE DA FOLLOWIN COURSEWRK?
    ESTIMATE

    Brian asked 120 people to estimate the area of a rectangle

    These are the estimates people gave to Brian for the area of the rectangle.


    All measurements are in square centimetres.

    90.5 140.6 180 151.55 112 129.7
    100 134.6 168.3 201.3 146.4 132
    189 152.25 126.3 141.3 165 147.4
    170 188 136.2 144.8 139 126
    41.2 100 129 156.2 146.8 146.9
    141 111 134.8 155.5 183 157
    157.7 161.5 144 119.1 125 125
    130 132.2 147.9 151.6 159 154.2
    122 129 139.5 146 132 133.7
    146.6 155 146.8 158.9 165.3 119
    143 121.25 115 166 183 108.2
    155.8 149 148.2 146.3 175.9 157.3
    118 170 138 129 148.5 166
    169.3 137.1 142.6 134.2 93 167.4
    111.3 147.3 160 141.8 177 100
    139 177.4 184 140 146.2 131.8
    135.5 135.5 145 175 250 122
    166.2 138 135.8 160 151 133
    95 145.4 190 162.6 140 125
    147.8 149.5 164 137.4 121.1 169


    The area of the rectangle is 145.36cm2

    1. Which estimate was closest to the correct answer? 145.4

    2. What was the mean estimate? 144.5613

    3. Use the data to decide how good at estimating areas these people are

    4. Extend your investigation, making clear rules and methods that you use.


    I must analyse the estimates that were made for the area of this rectangle. How?????????? i no i must find averages, put em in tables etc.

    I know wat i mst do for extention
    but were i have to analyse da above how am i suppose to find da mean and median values when i have grouped dem???

    this is how ive grouped em:


    estimates frequency
    0-50 1
    50-100 3
    100-150 73
    150-180 34
    180-210 8
    210-250 1


    dis is da data wen ordered
    41.2
    90.5
    93
    95
    100
    100
    100
    108.2
    111
    111.3
    112
    115
    118
    119
    119.1
    121.2
    121.25
    122
    122
    125
    125
    125
    126
    126.3
    129
    129
    129
    129.7
    130
    131.8
    132
    132
    132.2
    133
    133.7
    134.2
    134.6
    134.8
    135.5
    135.5
    135.8
    136.2
    137.1
    137.4
    138
    138
    139
    139
    139.5
    140
    140
    140.6
    141
    141.3
    141.8
    142.6
    143
    144
    144.8
    145
    145.4
    146
    146.2
    146.3
    146.4
    146.6
    146.8
    146.8
    146.9
    147.3
    147.4
    147.8
    147.9
    148.2
    148.5
    149
    149.5
    151
    151.55
    151.6
    152.25
    154.2
    155
    155.5
    155.8
    156.2
    157
    157.3
    157.7
    158.9
    159
    160
    160
    161.5
    162.6
    164
    165
    165.3
    166
    166
    166.2
    167.4
    168.3
    169
    169.3
    170
    170
    175
    175.9
    177
    177.4
    180
    183
    183
    184
    188
    189
    190
    201.3
    250
    total =17347.35
    mean= 144.5613
    mode=
    median=145.2 (60.5th valu)
    range=208.8

    thanx - if ne 1 cud hlp me id greatly appreciate it!!!
    mode is the most common value. id also work out the standard deviation - shows how srpread out the data is. See the other thread as well
Updated: April 7, 2005
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