Is the week is seven days due to the number of stars in the Big Dipper. True or False?

I'm guessing your question is "We have 7 days in a week because there are 7 stars in the big dipper. True or False?"

I would say false because I have never heard of that before and I work in a Planetarium. I could be wrong. I might of just never heard of it before for some odd reason. I think it is just complete coincidence though. It would be like there are 7 days in a week because there are 7 continents.