I think that category would also be insightful to break down by shaker and no-shaker. I think the poll might shed more light if the options were:

Failure on non-shaker machine
Failure on shaker machine
No Failure on non-shaker machine
No Failure on shaker machine

And personally, I'm in the 4th category. Also, allow multiple votes: maybe someone has no failure on non-shaker and failure on shaker.

It was a good thought, but not sure what you expect to learn the way it is. You could have edited the first message and pointed to a new poll that you might actually be able to deduce something from.

% of shaker machines with issues versus % of non-shaker machines with issues would be way more telling.

That's meaningless as you don't know the number of respondents that have shakers or not.

But it is showing that there's a pretty high % of failures: 10 of 41.

Maybe it's just the same as: of the respondents, how many had shakers...

Giving you a hard time... but it's because with one more option, this might have actually shown something. I thought you started with the thought there was a correlation with having a shaker.

Have fun.