please help answer all of the blanks

Use the information provided to answer the questions. Population 1 11 3 7 4 Population 2 15 7 7 9 6 5 LO USE SALT State the null and alternative hypotheses for testing for a significant difference in means. O Ho: (M1 - M2) = 0 versus Ha: (M1 - 12) * 0 O Ho: (M 1 - 12) 0 O Ho: (M1 - M2) = 0 versus Ha: (M1 - 12) 0 O Ho: ( M1 - 12 ) * 0 versus Ha: (1 1 - 12) = 0 Calculate the pooled estimate of of, the associated degrees of freedom, and the observed value of the t statistic. (Round s and your t statistic to three decimal places.) df t What is the rejection region using a = 0.05? (If the test is one-tailed, enter NONE for the unused region. Round your answers to three decimal places.) t > t