use dependent samples t test. Set hypothesis so what formula will I use to solve

Question

Five people who were convicted of speeding were ordered by the court to attend a workshop. A special device put into their cars kept records of their speeds for two weeks before and after the workshop. The maximum speeds for each person during the two weeks before and the two weeks after the workshop are shown below. Using a two-tailed test, determine whether the workshop worked in reducing their speed.

here are the scores for before 65,62,60,70,68 and after 58,55,56,66,60
hypothesis be Ho:md=0 and H1:md is not equal to 0

Answer 1

You are looking for reduced speeding.

I am assuming "md" indicates the mean of the difference.
Ho is correct by H1 should be md<0

Be sure you subtract in the correct way.
after - before = less than zero

Use the formula for the t-test for dependent samples (sometimes called matched pairs). It should be in your book. It really is too complicated to write out here.