240 



LINEAR REGRESSION AND CORRELATION 



Ch. 7 



62. The cumulative and r.c.f. distributions given below are those of the sizes 

 of peach orchards in the Sandhills of North Carolina during 1946. (Data from 

 Technical Bulletin 91, North Carolina Agricultural Experiment Station.) Do 

 the sizes of these orchards follow a normal frequency distribution quite well, 

 or is their distribution far from normal? 



63. Referring to problem 62, what is the median size of orchard? The lower 

 limit of the second quartile? 



The following scores on certain academic aptitude tests and the student's 

 grade point average (GPA) at the end of the indicated year are to be the 

 basis for answering the questions in problems 64 to 70, inclusive. These data 

 constitute samples from classes taking a natural science comprehensive course 

 at Kansas State College. 



Freshmen 

 ACE-T ACE-L ACE-Q GPA ACE-T 



ACE-L ACE-Q GPA 



