10 MODE8:DIM:GOSUB900:c$=CHR$(5):f=95:r=0:s=0
45 CLS:PRINT"B(1,p) a<p<b";
50 z=r:s$="n":GOSUB500:r=z
60 z=s:s$="äx":GOSUB500:s=z
90 CLS:PRINT"Confidence level (1-à)[%]";
95 z=f:s$="1-à":GOSUB500:f=z:IFf<0 ORf>100 THEN95
97 CLS:PRINT"B(1,p)   ";f;"%";TAB(0);".....";
100 p=(1-f/100)/2:sr=0:GOSUB"LIB0:S6410":GOSUB900:IFsr THEN*
110 e=s/r:z=e-x*SQR(((1-e)*e)/r):GOSUB400:a=z
120 z=e+x*SQR(((1-e)*e)/r):GOSUB400:b=z
130 PRINTc$;a;"< p <";b;:a$=INPUT$(1,@):GOTO45
140 GOTO50
400 IFz THENz=ROUND(z,LOG(ABSz)-5)
410 RETURN
500 LOCATE0,1:PRINTc$;s$;"=";z;"?";:INPUT@10;z:LOCATE0,0:RETURN
900 ONERRORGOTO910:RETURN
910 IFERR=1 THENCLS:ONERRORGOTO0
920 IFERL=500 THENRESUME500
930 LOCATE0,1:PRINTc$;"not found";:z$=INPUT$(1,@):RESUME45