Question: Use provided data to test whether the distribution of the final grades for the freshman and seniors in the last semester’s class are equal. Random samples of n₁ = 320 freshman and n₂ = 280 seniors yielded the following final grades:

Define a) the null hypothesis for testing that the grade distributions for freshman and seniors are equal, b) a critical region having an \[\alpha \] = 0.01 significance level, c) calculate the value of the test statistic, d) what is your conclusion?