Couple more thoughts....
You can disconnect and connect to try to get a better connection - watch those letters in the lower left - but this can change by the minute.
You can be 100 feet from another person running the same speed tests and get far different speeds.
I used to run tests at . . . http://www.numion.com/YourSpeed3/Select.php . . . because I could set it up to run a test every 3 minutes for an hour (20 tests) and see all the tests and an average speed over the hour of the tests. You can do this once an hour for a day or whatever - to get your average speed. You can do this manually with other speed test websites. I have seen speeds all over the chart from one minute to the next.
BUT BUT BUT - in my experience most speed tests use about 10mb of the data allotment we are paying for - running speed tests uses up all our time.
I use PVC pipe to raise our stick up over our RV and then connect to the computer using a USB extension cable. I even move the pole around to see if the stick does a little better even just a few feet away. But then there are so many other factors from how many others are using that tower to which way the wind is blowing that can affect the speed you are getting at this moment in time. We just do the best we can an if things aren't going very well maybe they will get better the next time we sit down at the computer to try again.