方差置信区间

def solve():
    import pandas as pd
    import matplotlib.pyplot as plt
    from scipy.stats import chi2
    url = '____'
    df = pd.read_csv(____)
    n, s2 = len(____), df['____'].var()
    lo = round((____)*s2/chi2.ppf(____,n-____), ____)
    hi = round((____)*s2/chi2.ppf(____,n-____), ____)
    print(____)
    plt.errorbar(____)
    plt.xlim(____, ____); plt.ylabel(____); plt.title(____); plt.tight_layout(); plt.show()