By Carla Mozee and Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- European stocks markets ended a volatile day on an upbeat note on Friday after U.S. housing data spurred a positive mood on both sides of the Atlantic, while a fall in German business confidence prompted investors to assess the chances of action by the European Central Bank.

The Stoxx Europe 600 index added 0.2% to close at 341.76, ending 0.8% higher for the week, for a sixth straight weekly gain.

The benchmark started to advance in the afternoon after U.S. stocks opened in positive and data showed homes sales for April beat expectations.

Earlier in the day, European markets hovered around the flat line after the widely watched Ifo Business Climate Index fell to 110.4, missing expectations for 110.9. The Ifo expectations and current-conditions surveys for Germany -- Europe's largest economy -- also fell short of projections.

The overall Ifo is still at elevated levels "but it has clearly been shaken by the recent events in Ukraine and the lackluster pace of recovery in [the euro zone] as a whole," said Boris Schlossberg, managing director of FX strategy at BK Asset Management, in a note on Friday.

The euro (EURUSD) fell to $1.3626 compared with $1.3644 just ahead of the confidence data. Schlossberg said the Ifo data will prompt an interest-rate cut and consideration of other easing measures by the ECB.

"The key question now is just how aggressive will ECB be," he said. "Most of the market participants expect a rate cut both in refi and deposit rates--something that should spur even more spending from the penny-pinching Germans, as saving will become even less attractive."

Germany's DAX 30 index gained 0.5% to 9,768.01, marking the highest closing level on record. For the week, the index picked up 1.4%. Earlier, German government figures confirmed economic growth in the first quarter. On the DAX, shares of Lanxess AG rose 1.5% after Goldman Sachs lifted the chemicals firm to buy from neutral.

Elsewhere, France's CAC 40 index nudged higher by 0.3% to 4,493.15, for a 0.8% gain on the week. But the U.K.'s FTSE 100 index shed 0.1% to 6,815.75, as Tullow Oil PLC fell 1.2% after the company said only traces of thermogenic gas were found in the Shimela-1 well in Ethiopia. The London benchmark fell 0.6% on the week.

But shares of Barclays PLC (BCS) in London gained 1.3% after the U.K.'s Financial Conduct Authority said the bank will be fined more than GBP26 million ($43.9 million) for failings around the London Gold Fix. The bank and an ex-trader, Daniel James Plunkett, avoided higher fines of more than GBP37 million and GBP136,600, respectively, by agreeing to settle at an early stage.

Meanwhile, Pandora AS shares fell 4.2%, the steepest loss on the Stoxx 600, after the Danish jewelry retailer said it was selling 13 million shares to institutional investors.

In other developments, Europeans in 28 countries have or will vote in European Parliament elections. So-called euroskeptics, or parties that want to break down the power of the EU, look set to take more seats than ever. Voting ends on Sunday.

Trading in the U.K. will be closed Monday for the Bank holiday.

More must-read news from MarketWatch:

Europe's continental vote will have local effects

The rise of the euroskeptics: Just who are they?

Champions League final: Atletico's fairy tale without a happy ending

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