When viewing the battery stats for the "Last 24 Hours", you can see when the phone was on the charger, and click on those times it's on the charger to see screen on/off time and app usage when connected to the charger. However, when you select a single day on the "Last 10 Days" section, you only see a percent of battery used. Do the screen on/off and app stats only report for the times the phone was off the charger in this view?
If it counts all data during the day, even when it's plugged in, then the stats would be worthless, as you could have used it 100% of the time while it's on the charger, then unplug it, and you'd have wildly skewed results.
If it counts all data during the day, even when it's plugged in, then the stats would be worthless, as you could have used it 100% of the time while it's on the charger, then unplug it, and you'd have wildly skewed results.