Dean suspects that statistics teacher increase the grades of the class of 75 students due to his endless love to his beloved students. Dean tealized that average grade of previous statistics classes...

Dean suspects that statistics teacher increase the grades of the class of 75 students due to his  endless love to his beloved students. Dean tealized that average grade of previous statistics classes in 64 and she took some of the exams from student affairs departments and note the following grades: 65 75 98 34 76 52 80 84 68.

a) help Dean to conduct a statistical analysis

b) interpret the results