Researchers wanted to know if obese parents were more likely to have obese child

Question

Researchers wanted to know if obese parents were more likely to have obese children than were parents of normal weight (Fiore et al., 2006). Obesity was defined as being above the 85th percentile on the body-mass index. A total of 1890 families were contacted with children ranging in age from 12 to 16. For this example, assume the following data (modeled after the Fiore study):

For this example, assume the following data (modeled after the Fiore study):

              Neither                       One                          Both

             Parent Obese      Parent Obese            Parents Obese

Child

Obese           183                         240                         378

Not Obese    447                         390                         252

Find the correlation between parental obesity and childhood obesity.

Chi Square = ______________

p < or > .05 or .01? ______

df = ______

Correlation, C = __________

Write a sentence explaining the results.

Explanation / Answer

chi square =130.6918

p<0.01

df=(row-1)*(column-1) =1*2=2

correlation C=(X2/(x2+n))1/2   where n=1890

=0.2543

from above there seems to be weak correlation b/w parental obesity and childhood obesity

Observed O neither parent one both Total obese 183 240 378 801 not obese 447 390 252 1089 Total 630 630 630 1890 Expected E=rowtotal*column total/grand total neither parent one both Total obese 267.0 267.0 267.0 801 not obese 363.0 363.0 363.0 1089 Total 630 630 630 1890 chi square =(O-E)^2/E neither parent one both Total obese 26.427 2.730 46.146 75.303 not obese 19.438 2.008 33.942 55.388 Total 45.865 4.739 80.088 130.6918

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