Help!

Which of the following is true?

a. If a 90% CI for the mean is (75.3 to 80.9), we would reject H0: Mean=70 in favor of H1: Mean not equal 70 at alpha = 0.05.

b. If a test is run and p=0.0356, then we can reject H0 at alpha = 0.01

c. If a 95% CI for the difference in two independent means is (-4.5 to 2.1), then the point estimate is -2.1

d. If a 95% CI for the difference in two independent means in (2.1 to 4.5), there is no significant difference in means

e. The margin of error is always greater than or equal to the standard error.