BENG 449 Problem 2 4

BENG 449 Problem 2 4 - sqr_diff = 0 for i = 1:n sqr_diff =...

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2/7/08 6:48 PM MATLAB Command Window 1 of 1 >> % BENG 449 -- Problem Set 2, Question 4 % Written by Alex Lemon disp([' ']); % Create a random vector X with 20 elements from the uniform % probability distribution on (0,1). n = 20; X = zeros(1, n); for i = 1:n X(i) = rand(); end % 1.) Compute the sample mean % 1A.) Using the definition of sample mean sum_x = 0; for i = 1:n sum_x = sum_x + X(i); end x_bar = sum_x / n; disp(['Using the formal definition, the sample mean of X is ', . .. num2str(x_bar)]); % 1B.) Using Matlab's built-in function disp(['Using the built-in function, the sample mean of X is ', . .. num2str(mean(X))]); % 2.) Compute the sample variance % 2A.) Using the definition of sample variance
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Unformatted text preview: sqr_diff = 0; for i = 1:n sqr_diff = sqr_diff + (X(i) - x_bar)^2; end samp_var = sqr_diff / (n - 1); disp(['Using the formal definition, the sample variance of X is ', . .. num2str(samp_var)]); % 2B.) Using Matlab's built-in function disp(['Using the built-in function, the sample variance of X is ', . .. num2str(var(X))]); Using the formal definition, the sample mean of X is 0.46457 Using the built-in function, the sample mean of X is 0.46457 Using the formal definition, the sample variance of X is 0.11004 Using the built-in function, the sample variance of X is 0.11004 >>...
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