Hypothesis Testing with T-Statistic - Quant Researcher Interview Question

Problem Description

Hypothesis testing provides a statistical framework to determine if a trading strategy's average return is significantly different from zero or merely the result of random noise. By calculating the T-Statistic and P-Value, quantitative researchers can assess the validity of a strategy against a null hypothesis of zero mean return. This process is essential for rigorous backtesting and minimizing false discoveries in algorithmic trading. Task Implement a function solution(returns) that calculate