描述统计vs推断统计

def solve():
    import pandas as pd
    import matplotlib.pyplot as plt
    url = 'https://data.zuihe.com/wooldridge/wage1.csv'
    df = pd.read_csv(url)
    print(f'样本均值: {df["wage"].mean():.2f} 美元/小时')
    print(f'样本量: {len(df)}')
    df['wage'].hist(bins=30, color='steelblue', edgecolor='black')
    plt.xlabel('工资'); plt.ylabel('频数'); plt.title('工资分布')
    plt.tight_layout(); plt.show()