The most recent jobs report shows not only did the US economy create more jobs in April than expected, the number of jobs created in February and March were revised upward as well. This takes some of the steam out of the negative talk about the lower unemployment rate being only about workers who have stopped looking for jobs. The stock market is responding positively because job numbers are important to the overall economy.
Numbers get revised in the following months as more data comes in. For example, the April jobs report was released just days after the end of April. That takes a bit of trust in your numbers. When you get to go back through them with a fine tooth comb, you can spot things that are different.
You can read the CNN story about the jobs report for details.
More details to follow here on Finance Gourmet.