Federal Reserve Leaves Key Overnight Interest Rate Unchanged In 3.50-3.75% Range, Says Committee Will Deliver Price Stability; Says Inflation Remains Elevated Relative To 2% Goal, In Part Reflecting Supply Shocks That Have Caused Price Increases In Certain Sectors, Including Energy; Economic Activity Is Expanding At Solid Pace Despite Elevated Uncertainty That Owes, In Part, To Middle East Conflict