A school district has developed a teaching proficiency scale based on (a) improvements in student achievement, (b) aflg by peers and (c) ratings by administrators Te district data indicates that teachers who, at me end of their 3rdear, a.tain : aci tys up ! or higher on the teaching proficiency scale are likely to have fewer discipline problems . ith students, to in.eraci Ted with students parent and one less likely to suf f noin thecher -burn out The state department of education re. wires all applicants for a teaching certification to take a nationally norme. teacher certification examination rigure . is a scatter plot (shown below) that shows the relationship between the teacher certification test and the 3rd year teaching proficiency scale for the last 30 teachers hired by the district Table 1 shows the data from this group of teachers. The correlation between the teacher certification examination and the teacher proficiency scale is 0 523