I downloaded Matlab recently for my project but cannot do z test and t test. Is there any tutorial (video) for it?

I downloaded Matlab recently for my project but cannot do z test and t test. Is there any tutorial (video) for it

Answer 1

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You have to have the Statistics Toolbox to have full access to these tests. However, if you do not have the Statistics Toolbox, a description of the tests can be found in Wikipedia, and the test statistics are easy to code. The t-distribution and its inverse is also easy to code using core MATLAB functions:

% Variables: 
% t: t-statistic
% v: degrees of freedom

tdist2T = @(t,v) (1-betainc(v/(v+t^2),v/2,0.5));    % 2-tailed t-distribution
tdist1T = @(t,v) 1-(1-tdist2T(t,v))/2;              % 1-tailed t-distribution

% These calculate the inverse t-distribution (parameters given the
%   probability ‘alpha’ and degrees of freedom ‘v’: 
tstat = @(tval) (alpha - tdist2T(tval,df) );        % Function to calculate t-statistic for p = ‘alpha’ and v = ‘degrees-of-freedom’
[T,fval] = fzero(tstat, 1);                         % Calculate t-statistic for p = ‘alpha’ and v = ‘degrees-of-freedom’

See the documentation on the core MATLAB function erf for instructions on how to use it to calculate the normal distribution and its inverse.