Fresh copy of C3_W4_Assignment

My notebook seems ok when I run it, i.e all cells and the check code work fine. My submission fails reporting ‘expecting’ function but getting ‘None’ objects. This propagates from function ’ t_statistic_diff_means’; My guess is that I must have changed/deleted cells by mistake. Unfortunately, I didn’t back up before changes. Can anyone provide me with a fresh copy of the above mentioned notebook, please?

See the FAQ, it has instructions for this:

Thanks a lot Tom!