Science Project help! (Pendulum Problem)?

You may need to run this more than twice. Do the same length as you have & the same two weights, but do each 5-10 times. You also need to show that the same weights on a different length. You should end up with 4 parts of data (8oz length 1 & 2), (16oz length 1 &2), (8oz & 16oz length 1) and (8oz & 16oz length 2). You should calculate the average, also how about just dropping the rope w/o any weight? Any number of errors can happen in a 45min-1hr period. If not sometimes being able to show that the common theory isn't supported by actual testing is always interseting.