DETERMINING CLASSROOM COMMUNICATION AND ACADEMIC PERFORMANCE OF LEARNERS WITH HEARING IMPAIRMENT; A CASE OF KAMBUI SCHOOL FOR THE DEAF- KIAMBU COUNTY-KENYA MUIRURI LUCY WAMBUI E55/21788/2012 A THESIS SUBMITTED IN PARTIAL FULFILMENT FOR THE DEGREE OF MASTER OF EDUCATION (SPECIAL NEEDS EDUCATION) IN THE SCHOOL OF EDUCATION OF KENYATTA UNIVERSITY JULY, 2015