Instruction: Evaluate the answerability of a question by analyzing the related document, outputting yes if the document contains information addressing the question, and no otherwise.

Input:
Question: The A20 (2011) literature mentions a two position adjustable lumbar, Does this model (2013) have an adjustable back?
Document: I have had another schwinn exercise bike prior to this one and I hated it. I forget the model number of it but it was an earlier generation of this bike. The only good thing about it was you didn't need batteries. The display was powered by your pedal power. This new model, the A20 however requires batteries to operate.
When it first arrived, it would make a small thumping sound when you rode it. I took the cover off, found nothing wrong, put the cover back on, and it worked perfectly. It is now amazingly quite and offers a good range of resistance.
The bike is easy on the back and easy to adjust. No picking up the end of the unit to move the seat. This is a big plus for someone with back problems like me. The preprogramed rides give a good workout and can be easily programed to start at an easy pace. It came in on time. It is somewhat difficult to assemble but if you follow the directions, you will not have problems. The only negative is lack of lighting on the display.
First I want to thank all the people who answered my question - you were all very helpful.This bike is wonderful for short people - I am only 4'10&#34;, not only can I reach the pedals - I have a notch or 2 to spare. So even shorter people should be able to use this bike.The bike is smooth and works great. I'm using it to get back in shape after surgery :( and to help with lung problems.
I'm 6' with long legs and there's still room to move the seat back further if you are even taller.My only complaint is that is doesn't come with the AC adaptor. I ordered one along with 2 extension cables so that I could plug it in instead of using batteries.If you're already using home equipment regularly and are looking for an advanced workout, this is not the machine for you. But if you are looking to add more activity to your daily life this might work for you.
this is a great bike and great way to get in shape if you don't like running my only complain is it didn't com with a 120v power cable and have to use D batteries besides that really good bike.
assembly was easy with step by step instructions and tools to do the job.console another matter.. still can't get my name set to track usage.it'll track daily programs but  won't accumulate scores.otherwise i love my workout.
You change the adjustment on the control buttons, and it takes 6 to 8 seconds for the bike to respond and change resistance. The strongest resistance setting is not terribly hard, but it will tire you out, plus if you need more than that, you probably need a more heavy duty exercise bike.Three is a small speaker system, in the control panel where you can plug in a cable from the headphone jack of your mp3 player or phone.
We purchased this bike after our older bike (purchased used from Craig's list) broke down. Ordered it sight unseen. GREAT bike for the price; we use batteries (instead of a plug), and we don't use the speakers; my husband uses this for 20 miles daily. Works great overall! The foot straps pop off every once in a while, but that just takes some adjusting. Great purchase!
This was a good purchase
Answer: no