The service sector expanded for the 11th straight month in November and at the fastest pace in six months.

Friday's report from the Institute for Supply Management, a private trade group, follows a string of other indicators this week indicating the economy is steadily improving. But the Labor Department issued a disappointing jobs report Friday that showed the expansion didn't boost hiring in November. The unemployment rate rose to 9.8 percent last month, as job creation slowed.

The ISM said that its service sector index, which covers 80 percent of the economy, rose to 55 last month from 54.3 in October. It was the highest reading since May. Any figure over 50 indicates growth.

"Economic activity is still moving along, but uncertainty and a lack of clarity over the economy and over regulatory issues continue to impede hiring," said Jennifer Lee, an economist at BMO Capital Markets.

Some economists were mildly encouraged by the ISM's index of new orders, which rose by one point to 57.7, and its employment index, which moved to a three-year high of 52.7.

Those are more forward-looking indicators than the employment report, said Brian Levitt, an economist at OppenheimerFunds. They signal that hiring and growth will likely improve in the coming months.

Still, the ISM's report on the service sector is consistent with annual economic growth of about 3 percent, economists said. That's weak for a recovery after such a steep recession, and not enough to rapidly reduce unemployment.