Monte Carlo, Markov Chains, Metropolis Hastings.
print('the 97.5% quantile is: ', theta_975_quantile) # output the 2.5% quantile is: 0.08962180547280807 the 97.5% quantile is: 0.9119102420388027 Therefore, 0.5 is within [0.089, 0.912], fail to reject null hypothesis: p(Head) = θ = 0.5, this is an unbiased coin. It is a true unbiased coin because