Gavin's Study Compared Reading Error Rates and Reading Comprehension Scores

Multiple Choice

Gavin's study compared reading error rates and reading comprehension scores between two groups of 50 third-grade students that received different reading programs. His t test data analysis did not indicate any differences between the two types of instruction. The most likely reason for his findings is that

A) his measures did not measure reading.
B) his sample is too small.
C) he conducted the wrong analysis.
D) his groups were too similar.