Matrix error must agree problem

Caleb Jalmasco

2019 7 21

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4 次查看（30 天）

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Hi. I'm doing a stand alone matlab code for ztest. And when it comes to computing for the z-value, it keeps saying matrix error. Please help thank you!

%Hypothesis testing: Z-test for mean
format bank
disp 'Hypothesis Testing for Mean - Variance Known'
n=input('Sample size = ');
mu=input('Population mean = ');
mean=input('Sample mean = ');
s=input('Standard deviation = ', 's');
a=input('Alpha = ');
disp 'Using Traditional Method'
disp 'Step I. State the hypothesis'
fprintf('H0: mu = %d. \n',mu);
ope = input(' The alternate is ', 's');
fprintf('H1: mu %s %d. \n',ope, mu);
if strcmp(ope,'<')
   disp 'One-tailed'
   disp 'Step II. Find the critical value'
   cv = norminv(1-a);
   fprintf('The critical value is %d. \n',cv);  
   disp 'Step III. Compute the test value'
   zval = (sqrt(n).*(mean-mu))./(s);
   fprintf('The test value is %d. \n',zval);
   disp 'Step IV. Make a decision'
   if cv>zval
       fprintf('Reject H0!')
   else
       fprintf('Accept H0!')
   end
elseif strcmp(ope,'>')
    disp 'One-tailed'
    disp 'Step II. Find the critical value'
    cv = norminv(1-a);
    fprintf('The critical value is %d. \n',cv);
    disp 'Step III. Compute the test value'
    zval = (sqrt(n).*(mean-mu)./s);
    fprintf('The test value is %d. \n',zval);
    disp 'Step IV. Make a decision'
   if cv>zval
       fprintf('Reject H0!')
   else
       fprintf('Accept H0!')
   end
else
    disp 'Two-tailed'
    disp 'Step II. Find the critical value'
    A = a./2; 
    cv1=norminv(A);
    cv2=norminv(1-A);
    fprintf('The critical values are %d. \n',cv1, cv2);
    disp 'Step III. Compute the test value'
    zval = (sqrt(n)*(mean-mu))/(s);
    fprintf('The test value is %d. \n',zval);
    disp 'Step IV. Make a decision'
   if cv > zval
       fprintf('Reject H0!')
   else
       fprintf('Accept H0!')
   end
end