A Stat question need to be solved, hope can get the right answer. Explanations are not necessary. just want to make sure my own answer is right.

Question 5 For each of the following experiments, decide whether the difference between conditions is statistically significant at the .05 level (two-tailed). 6 poms Experimental Group Control GI'OUP Y\"" decision N M 52 N M 52 a) 30 12 2.4 30 11.1 2.8 'ml b) 20 12 2.4 40 11.1 2.8 'ml c) 30 12 2.2 30 11.1 3 Click for List Do not reject the null hypothesis Reject the null hypothesis