The Heavenly Grace Christian Elementary School has decided to examine whether using biblical materials to teach reading has an impact on reading levels. Last year, a test revealed that the average sixth-grade student read at a 5.7 grade level. This year, after all secular humanist material was deleted from the curriculum, a 20-person sample of the sixth- grade student body was tested, with the following results:
Mean = 6.4 Standard deviation = 1.9
Present a hypothesis and a null hypothesis, and evaluate them. State your conclusion in plain English.