130 LABOR A TOR Y G UIDE IN PH YSIOL OGY. 



Apply this formula to the case taken for example : 



I (--'- i*) 



= = 56.3. 



74 

 or 



1 (-?- - 106) 



P. = 57 =^ f- = 57 0.703 = 56.3. 



After one has found the median value for each 

 measurement in each group, these may be tabulated and 

 the values compared. When the table of median values 

 is large it is almost necessary to carry the work of reduc- 

 tion a step farther and represent these values graphically 

 in a chart. Another opportunity will be used for giving 

 the methods used in the graphic representation of statis- 

 tical tables. 



The table which results from the data collected in 

 connection with the previous lesson is not so large but that 

 the observer can practically comprehend the whole at a 

 glance. 



Our grouping enables us to answer the following ques 

 tions : 



First. Has general physical activity any essential in- 

 fluence in the development of the respiratory organs and 

 function ? 



Second. Is the climbing of hills during early life a 

 factor in the development of the respiratory organs and 

 function ? 



If both of these questions may be answered affirma- 

 tively then one would expect to find that the median values 

 of group I, (active individuals from a hilly country) uni- 

 formly exceed the values of group II; and that those of 

 group III uniformly exceed those of group IV, but that 

 the median values of group II may or may not exceed 

 those of group III. 



The following conclusions are quoted from a student's 

 note book : 



