In the academic year 200405, 1126 high school freshmen took the SAT Reasoning Test. On the Critical

Question:

In the academic year 2004–05, 1126 high school freshmen took the SAT Reasoning Test. On the Critical Reasoning portion, this group had a mean score of 491 with a standard deviation of 119. The following year, 5042 sophomores (none of them in the 2004–05 freshmen group) scored an average of 498, with a standard deviation of 129. Is the higher average score for the sophomores a result of such factors as additional schooling and increased or simply a random effect? Test at the α = 0.05 level of significance. Maturity
Maturity is the date on which the life of a transaction or financial instrument ends, after which it must either be renewed, or it will cease to exist. The term is commonly used for deposits, foreign exchange spot, and forward transactions, interest...