Consumer confidence, running consistently high for the past few months, took a slight dip in July, down to 91.6 from June's 92.5. Dow Jones industrial average down 6.16 points, closing at 3735.68 . . N.Y.S.E.'s composite index down 0.48, to 250.24 . . . NASDAQ stock market composite index fell 1.22, to 715.66 . . . American Stock Exchange rose 0.44, to 434.50 . . . Gold up $2.20, to $387.10 on the Commodity Exchange in New York . . . The 30-year Treasury bond closed with a yield of 7.54 percent, up from 7.52 late Monday.