ALT OVERSHOOT WHEN AN SF340 FLT CREW CLBS ABOVE THEIR ASSIGNED ALT WHEN THE ALT ALERT IS IMPROPERLY SET BY THE FO PRIOR TO DEPARTING MSP; MN.

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WHILE LEVELING OFF AT 5000 FT; MSP DEP CTL ASKED US TO SAY OUR ALT. WE TOLD THEM WE WERE LEVELING AT 5000 FT. THEY ASKED IF MSP TWR GAVE US THAT BECAUSE THEY SHOWED WE WERE CLRED TO 4000 FT IN OUR CLRNC FROM CLRNC DELIVERY. THE FO LOOKED AT THE CLRNC SHE HAD WRITTEN DOWN AND NOTED THAT 4000 FT WAS INDEED OUR INITIAL ASSIGNED ALT. WE TOLD DEP THAT IT WAS OUR MISTAKE AND WE SHOULD BE AT 4000 FT. THE PROB AROSE WHEN THE FO WAS GETTING THE CLRNC FROM CLRNC DELIVERY. AS SHE WAS GETTING THE CLRNC; THE FLT ATTENDANT ENTERED THE FLT DECK AND STARTED TO ASK ME A QUESTION. DURING THIS TIME; I MISSED HEARING THE CLRNC AND THE READBACK. THE FO SET THE RADIOS FOR DEP AND DIALED 5000 FT IN THE ALT ALERTER. THIS DID NOT RAISE A RED FLAG IN MY MIND SINCE 5000 FT IS THE NORMAL INITIAL ALT GIVEN TO TURBOPROPS DEPARTING MSP. WHEN I LOOKED AT THE CLRNC THE FO HAD WRITTEN DOWN; I NOTICED THE 5000 FT WRITTEN. HOWEVER; AFTER BEING QUERIED BY DEP AND AFTER FURTHER EXAMINATION; I NOTICED SHE HAD 40/50 WRITTEN DOWN. THIS MEANT 4000 FT; EXPECT 5000 FT. FACTORS AFFECTING THIS ALTDEV WAS THE DISTR FROM THE FLT ATTENDANT DURING THE CLRNC ACQUISITION; THE FO PUTTING THE WRONG ALT IN THE ALT ALERTER AND MOST IMPORTANTLY; ME; THE CAPT; NOT LISTENING TO THE CLRNC AND NOT QUESTIONING THE FO ABOUT THE ALT. TO PREVENT THIS FROM HAPPENING AGAIN; I NOW MAKE SURE I LISTEN TO THE CLRNC AND VERBALLY GO OVER IT WITH THE FO. SUPPLEMENTAL INFO FROM ACN 620340: THE CLRNC ALTS WERE 'MAINTAIN 4000 FT; EXPECT 5000 FT IN TEN.' I WROTE THEM CORRECTLY ON THE CARD; BUT FAILED TO PUT 4000 FT IN THE ALT PRESELECTOR. 5000 FT FROM OUR PREVIOUS FLT WAS DIALED IN. THE CTLR QUERIED US. I REMEMBERED BEING INTERRUPTED IN THE FLT DECK BY THE FLT ATTENDANT WHILE THE CLRNC WAS BEING READ TO ME. I HAD TO TURN UP THE VOLUME TO SUFFICIENTLY HEAR OUR CLRNC. SHE WAS VERY NEW AND I KNOW SHE ISN'T YET AWARE OF WHEN IT IS APPROPRIATE TO CHAT WITH THE FLT DECK. 5000 FT IS A COMMON INITIAL ALT DEPARTING MSP AND I MAY HAVE LOOKED AT IT AND FIGURED IT WAS CORRECT; AND CONTINUED WITH OTHER PREPARATIONS. WE COULD HAVE PREVENTED THIS FROM OCCURRING IF WE HAD BEEN MORE VIGILANT AND NOT ASSUMED 5000 FT WAS CORRECT BECAUSE IT IS COMMON. MY PERSONAL REACTION TO OUR FLT ATTENDANT'S BEHAVIOR IS PROBABLY A FACTOR. I WAS IRRITATED; AND REMEMBER THINKING TO MYSELF ABOUT THIS AS I SET IN THE XPONDER CODE. I USUALLY SET IN THE ALT NEXT. HOW EASILY SOMETHING CAN GET MISSED AND ERRORS RESULT! VIGILANCE WITH CLRNCS AND RECOGNIZING MY WEAKNESSES COULD HAVE PREVENTED THIS.