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    "## ARMA Modeling: Residual Diagnostics\n",
    "\n",
    "**Functions**\n",
    "\n",
    "`tsa.SARIMAX`, `sm.stats.diagnostic.acorr_ljungbox`, `SARIMAXResults.test_serial_correlation`,\n",
    "`statsmodels.sandbox.stats.diagnostic.acorr_lm`\n",
    "\n",
    "### Exercise 69\n",
    "Compute the residuals from your preferred model from the previous exercise, as well as a random-walk model.\n",
    "\n",
    "1. Plot the residuals\n",
    "2. Is there evidence of autocorrelation in the residuals?\n",
    "3. Compute the Q statistic from both sets of residuals. Is there evidence of serial correlation?\n",
    "4. Compute the LM test for serial correlation. Is there evidence of serial correlation?"
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