PROBLEM 152 



177 



But we find that most of us differ slightly from the normal and 

 in the class represented the first boy is 5 feet 10 inches tall and 

 weighs 140 pounds, while the boy number 10 is but 5 feet 

 5 inches in height 



140 



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and also weighs 

 pounds. 



Arrange your graph 

 paper as shown at 

 the right, with the 

 greater weights to the 

 left of the page and 

 the less at the right. 

 The heights are to be 

 given vertically at the 

 left side of the paper. 

 Now pick out the 

 members of the class 

 and arrange them according to their weights and heights, placing 

 a dot on the graph paper at the intersection of a given weight 

 and height (as in the case of the boy who weighs 165 pounds and 

 who is only 5 feet 4 inches in height). After you have finished 

 connect all the dots. 



Observations. — Does the line formed follow the normal curve 

 shown in the chart (line xy) or does it vary? How do you ac- 

 count for this? 



Note. — This curve you have made is called the curve of correlation between 

 weight and height. We might also correlate age and weight, or age and height. 



Conclusion. — Using the above method, make a curve of cor- 

 relation showing the correlation between weight and height in 

 your own class. 



Problem 152 : Does heredity play any part in our lives ? 



Materials. — Statistics gathered by class demonstrations. 



Method. — Let each member of the class try to bring photo- 

 graphs of his parents and if possible of their parents. Write down 

 a Ust of all the physical traits or likenesses you can find in your 

 own family. Bring in written or verbal reports given by your 



HUNTER LAB. PROB. — 12 



