By Benjamin Pimentel, MarketWatch

SAN FRANCISCO (MarketWatch) -- Shares of Apple and semiconductor companies slipped, weighing down the tech sector Friday, even as Groupon and Hewlett-Packard rallied.

Apple (AAPL) was off 0.6% as the company's new iPad Air hit the stores. Chip stocks also retreated, led by Intel Corp.(INTC), Texas Instruments (TXN), Advanced Micro Devices(AMD) and SanDisk (SNDK).

On the upside, H-P (HPQ) rose more than 4%, while Groupon (GRPN) jumped 7%.

Groupon unveiled a revamped website in a bid to transition from being mainly an online daily deals site to an online market place. The company also introduced updated versions of its smartphone apps.

Shares of Facebook (FB) gained 0.5% as the social network continued to recover from steep loses following its third-quarter report on Wednesday. Facebook blew past Wall Street estimates, but then rattled investors with comments about signs of declining teen usage and its plan not to ramp up newsfeed ads.

The Nasdaq Composite Index (RIXF) was down 0.2% to 3,913. The benchmark was down 0.8% for the week. The Morgan Stanley High Tech 35 Index (MSH) and the Philadelphia Semiconductor Index(SOX) were also each down a fraction.

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