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<p style="color: darkmagenta;"><span style="color: #003300;"><strong><span style="font-size: medium;">S'estudia la relació entre les variables X<sub>i</sub> i Y<sub>i</sub> a partir dels resultats següents: </span><br /></strong><strong><br /> </strong></span></p> <table style="background-color: #ffffcc; background-image: url('http://lcmates.eu/none'); color: #006600; border-color: #003300; float: none; text-align: center; vertical-align: middle; border-style: solid; border-width: 4px; width: 401px;" border="4" frame="void" rules="none"> <tbody> <tr> <td style="width: 50%; border-color: #003300; border-style: solid; border-width: 1px;"> <p style="color: darkmagenta;"><span style="color: #003300;"><strong><span style="font-size: small;">X<sub>i</sub></span></strong></span></p> </td> <td style="width: 50%; border-color: #003300; border-style: solid; border-width: 1px;"> <p style="color: darkmagenta;"><span style="color: #003300;"><strong><span style="font-size: small;">Y<sub>i</sub></span></strong></span></p> </td> </tr> <tr> <td style="width: 50%; border-color: #003300; border-style: solid; border-width: 1px;"><span style="color: #003300;"><strong><span style="font-size: small;">#x1</span></strong></span></td> <td style="width: 50%; border-color: #003300; border-style: solid; border-width: 1px;"><span style="color: #003300;"><strong><span style="font-size: small;">#y1</span></strong></span></td> </tr> <tr> <td style="width: 50%; border-color: #003300; border-style: solid; border-width: 1px;"><span style="color: #003300;"><strong><span style="font-size: small;">#x2</span></strong></span></td> <td style="width: 50%; border-color: #003300; border-style: solid; border-width: 1px;"><span style="color: #003300;"><strong><span style="font-size: small;">#y2</span></strong></span></td> </tr> <tr> <td style="width: 50%; border-color: #003300; border-style: solid; border-width: 1px;"><span style="color: #003300;"><strong><span style="font-size: small;">#x3</span></strong></span></td> <td style="width: 50%; border-color: #003300; border-style: solid; border-width: 1px;"><span style="color: #003300;"><strong><span style="font-size: small;">#y3</span></strong></span></td> </tr> <tr> <td style="width: 50%; border-color: #003300; border-style: solid; border-width: 1px;"><span style="color: #003300;"><strong><span style="font-size: small;">#x4</span></strong></span></td> <td style="width: 50%; border-color: #003300; border-style: solid; border-width: 1px;"><span style="color: #003300;"><strong><span style="font-size: small;">#y4</span></strong></span></td> </tr> <tr> <td style="width: 50%; border-color: #003300; border-style: solid; border-width: 1px;"><span style="color: #003300;"><strong><span style="font-size: small;">#x5</span></strong></span></td> <td style="width: 50%; border-color: #003300; border-style: solid; border-width: 1px;"><span style="color: #003300;"><strong><span style="font-size: small;">#y5</span></strong></span></td> </tr> </tbody> </table> <p style="color: darkmagenta;"><span style="color: #003300;">Fes servir l'Excel per fer els càlculs (arrodoneix als centèsims)</span></p> <p style="color: darkmagenta;"><span style="color: #003300;"><strong>a).Calcula la mitjana de X<sub>i</sub></strong><strong><br /></strong></span></p> <p style="color: darkmagenta;"><span style="color: #003300;"><strong>b) Calcula la mitjana de Y<sub>i</sub></strong></span></p> <p style="color: darkmagenta;"><span style="color: #003300;"><strong>c) Calcula la covariància «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msub mathcolor=¨#7F007F¨»«mi mathvariant=¨bold¨ mathcolor=¨#7F007F¨»§#963;«/mi»«mi mathvariant=¨bold¨»xy«/mi»«/msub»«/math» </strong></span></p> <div align="justify"> <p style="color: darkmagenta;"><span style="color: #003300;"><strong>d) Calcula el coeficient de correlació (Pearson</strong>)<strong> r </strong></span><br /><span style="color: #003300;"><strong>e) Classifica la correlació {D,d}. D per directa, I per inversa, F per forta i d per dèbil. </strong><em>Directa si és positiva, indirecta si és negativa. Forta si, en valor absolut, és més gran que 0.5, feble en cas contrari.</em></span></p> </div>
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66.66667%
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33.33333%
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16.66667%
14.28571%
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11.11111%
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5%
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Answer 2
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None
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90%
83.33333%
80%
75%
70%
66.66667%
60%
50%
40%
33.33333%
30%
25%
20%
16.66667%
14.28571%
12.5%
11.11111%
10%
5%
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33.33333%
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