求教各位高手，我现在用bootstrap找confidence interval，
我的code如下
data spatial;
      input a b @@;
   cards;
   48 42 36 33 20 16 29 39 42 38 42 36 20 15 42 33 22 20 41 43 45 34
   14 22  6  7  0 15 33 34 28 29 34 41  4 13 32 38 24 25 47 27 41 41
   24 28 26 14 30 28 41 40
   ;
  
/*To use the %JACK or %BOOT macros, you must write a macro called %ANALYZE to do the data analysis
   that you want to bootstrap. The %ANALYZE macro must have two arguments:

   DATA=   the name of the input data set to analyze
   OUT=    the name of the output data set containing the statistics
           for which you want to compute bootstrap distributions.
*/
   %macro analyze(data=,out=);
      proc means noprint data=&data vardef=n;
         output out=&out(drop=_freq_ _type_) var=var_a var_b;
         var a b;
         *%bystmt;
      run;
   %mend;

/* %analyze(data=spatial,out=temp); proc print data=temp;run;*/

   title2 'Normal ("Standard") Confidence Interval with Bias Correction';
   %boot(data=spatial,alpha=.10,samples=100,random=123);

   title2 'Normal ("Standard") Confidence Interval without Bias Correction';
   %bootse(alpha=.10,biascorr=0);

   title2 'Efron''s Percentile Confidence Interval';
   %bootci(percentile,alpha=.10);

   title2 'BC Confidence Interval';
   %bootci(bc,alpha=.10);

   title2 'BCa Confidence Interval';
   %bootci(bca,alpha=.10);


   title2 'Resampling with Computation of Studentizing Statistics';
   %macro analyze(data=,out=);
      proc means noprint data=&data vardef=n;
         output out=&out(drop=_freq_ _type_)
            var=var_a var_b kurtosis=kurt_a kurt_b;
         var a b;
         %bystmt;
      run;
      data &out;
         set &out;
         stud_a=var_a*sqrt(kurt_a+2);
         stud_b=var_b*sqrt(kurt_b+2);
         drop kurt_a kurt_b;
      run;
   %mend;

   %boot(data=spatial,stat=var_a var_b,samples=100,random=123);

   title2 'T Confidence Interval';
   %bootci(t,stat=var_a var_b,student=stud_a stud_b,alpha=.10)

我最后得到的var b 90%的 bootstrap confidence interval是70到150，我dataset里面的var b竟然全不在90% confidence interval，所以求问是什么情况。我即使用t-distribution算90%  confidence interval  117 到228。
所以我不是很明白，为什么我dataset里面的data 全不在我的confidence interval