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In our research we compare the cholesterol level at age 15 and the cholesterol level at...

In our research we compare the cholesterol level at age 15 and the cholesterol level at age 46. We get this sample

chol. at 15    chol. at 46

154      228

122    200

154    200

124    201

134    207

201    164

156    198

108    203

We evaluate the correlation coefficient and get R=

math   Statistics-And-Probability   
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Answer #1

Formula for correlation coefficient is,

Calculation :

Chol.at 15 (x) Chol. At 46 (y) xA2 xy 154 122 154 124 134 201 156 108 23716 14884 23716 15376 17956 40401 24336 11664 228 200 200 201 51984 35112 24400 40401 42849 26896 39204 41209 322543 24924 27738 32964 30888 21924 228750 164 198 203 Total x = 1153 = 1601 Σ х2 172049 Σ у2

8 228750 (1153) (1601) 8 172049 - (1153)21|8 * 322543- (1601)-.

r = -0.56212

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