Oct 8 (Reuters) - The S&P 500 ended lower on Friday after data showed weaker jobs growth than expected in September, yet investors still expected the Federal Reserve to begin tapering asset purchases this year. Wall Street"s three main indexes were mixed for much of the session before losing ground toward the end. All three indexes posted weekly gains. Comcast Corp (CMCSA.O) tumbled after Wells Fargo cut its price target on the media company, while Charter Communications Inc (CHTR.O) fell after Wells Fargo downgraded that cable operator to "underweight" from "overweight". Both companies were among the biggest drags on the S&P 500 and Nasdaq. Real estate (.SPLRCR) and utilities (.SPLRCU) were the poorest performers among 11 S&P 500 sector indexes, down 1.1% and 0.7%, respectively. The S&P 500 energy sector index (.SPNY) jumped 3.1%, with oil up more than 4% on the week as a global energy crunch has boosted prices to their highest since 2014. read more Chevron (CVX.N) and Exxon Mobil (XOM.N) rallied more than 2% and were among the companies giving the S&P 500 the greatest lift. The Labor Department"s nonfarm payrolls report showed the U.S. economy in September created the fewest jobs in nine months as hiring dropped at schools and some businesses were short of workers. The unemployment rate fell to 4.8% from 5.2% in August and average hourly earnings rose 0.6%, which was more than expected. read more “I think that the Federal Reserve made it very clear that they don’t need a blockbuster jobs report to taper in November," said Kathy Lien, Managing Director at BK Asset Management in New York. "I think the Fed remains on track.” Futures on the federal funds rate priced in a quarter-point tightening by the Federal Reserve by November or December next year. read moreThe Dow Jones Industrial Average (.DJI) dipped 0.03% to end at 34,746.25 points, while the S&P 500 (.SPX) lost 0.19% to 4,391.35. The Nasdaq Composite (.IXIC) dropped 0.51% to 14,579.54. For the week, the S&P 500 rose 0.8%, the Dow added 1.2% and the Nasdaq gained 0.1%. Third-quarter reporting season kicks off next week, with JPMorgan Chase (JPM.N) and other big banks among the first to post results. Investors are focused on global supply chain problems and labor shortages.Analysts on average expect S&P 500 earnings per share for the quarter to be up almost 30%, according to Refinitiv. "I think it’s going to be a dicey earnings season," warned Liz Young, head of investment strategy at SoFi in New York. "If supply-chain issues are driving up costs, a company with strong pricing power can pass through those rising costs. But you can’t pass through a labor shortage if you can’t find workers to hire." Declining issues outnumbered advancing ones on the NYSE by a 1.24-to-1 ratio; on Nasdaq, a 1.52-to-1 ratio favored decliners. The S&P 500 posted 26 new 52-week highs and 3 new lows; the Nasdaq Composite recorded 86 new highs and 113 new lows. Volume on U.S. exchanges was 9.2 billion shares, compared with the 11 billion average over the last 20 trading days.