A researcher would like to evaluate the effect of a new read…

A researcher would like to evaluate the effect of a new reading program for second-grade students. For the past five years, a standardized test given at the end of second grade has produced a mean score of µ = 45, σ = 12. Half of the second graders used the new reading program for the entire school year. The other half of second graders used the current reading program for the entire school year. What test is most appropriate to use to analyze this data?