% data: table 1 of the paper shows that in math, the non-blind
% average score was [0.052, 0.003] for b/g and [-0.014 0.014] for blinded
% scores.
% from Sands/Lavy, 2015.

x = -3:0.01:3;

% upper graph, non-blind
subplot(2, 1, 1);
plot(x, 1/sqrt(2*pi)*exp(-((x-0.052).^2)/2), 'b');
hold on;
plot(x, 1/sqrt(2*pi)*exp(-((x-0.003).^2)/2), 'm');
ylabel('density'); xlabel('standardized score'); legend('boys', 'girls')
title('non-blind scores across students in math')

% lower graph, blind
subplot(2, 1, 2);
plot(x, 1/sqrt(2*pi)*exp(-((x+0.014).^2)/2), 'b');
hold on
plot(x, 1/sqrt(2*pi)*exp(-((x-0.014).^2)/2), 'm');
ylabel('density'); xlabel('standardized score'); legend('boys', 'girls')
title('blind scores across students in math')

saveas(gcf, 'scores_in_math_elementary.png', 'png');