"I checked my Lightroom preferences again ..."
Just as a side note, as I also, yes I am, guility of embarrassing miscues. Even after 40 years in the business, so it will likely show up again sometime! 
Ya gotta laugh at it.
But, anyway, I don't think there is a LR setting to actually change a file type like from RAW to jpg. LR is and braggs about being non-destructive. So you could have saved yourself that step.
@Debbie wrote:Tahdah, tahdah and just plain dahhhh!!! I figured it out and if I share the answer I'll sound just plain stupid. But here goes in case someone else has the same problem, or should I say the same misunderstanding. In short, as it turns out I didn't have the quality set on RAW. I had checked, and rechecked the menu>quality window several times and each time misread it until I was just looking in the manual. In it the list of quality options is in a single column. In camera RAW is in a second column next to L with a quarter circle. I thought I had RAW selected. I'd been saying that the letter L was there. The manual, thank goodness, had the single column and said that was a JPG. Here I was reading about battery checks etc and there it was. I had been checking settings a while back and managed to change from RAW to JPG and not figured that I'd not changed back correctly. Whew!!! Call me dumb but I'm stupidly delighted right now ;o) Thanks to all those who tried to help.
OK, Debbie, maybe you'll feel better after I confess to doing something every bit as stupid. Recently my wife and I were driving home from a visit to our daughter's house in Philadelphia, and I used the opportunity to drop off my two 7D's and a couple of lenses at Canon's Jamesburg service facility for their usual cleaning and inspection. (I'm a CPS Gold Member, so it's an included perk.) I knew from previous experience that this would result in a partial clearing of the camera's user settings. Some items, like my name and copyright notice, would be left intact; but others, like my autofocus microadjustment settings, would be wiped. I was ready for that, had long since committed the AFMA's to a spreadsheet, etc.
But alas, I overlooked the fact that the quality setting that you cite above was one of those that would revert to its factory default. And the default is high-resolution JPEG, not RAW. (I always use RAW, and my favorite photo editor, Digital Photo Professional, does a crummy job on JPEGs.) So a week later I blithely walked into a moderately important photo shoot with one of my cameras set to JPEG. Fortunately, the other camera I was using, an almost new 5D Mark III, hadn't been to Jamesburg and was correctly set to RAW. But about two thirds of the photos I took were JPEGs, so I'll have to block out a few hours, sit down with Irfanview or some other editor, and try to fix things up. It doesn't much matter when I get it done, and the world won't come to an end, but it's pretty damned embarrassing.
So there you have it. We all make mistakes. 
