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    "# Exercise 1.3: Split-Apply-Combine of the frog data set\n",
    "\n",
    "<hr>"
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    "We will continue working with the frog tongue adhesion data set.\n",
    "\n",
    "\n",
    "You'll now practice your split-apply-combine skills. First load in the data set. Then, \n",
    "\n",
    "**a)** Compute standard deviation of the impact forces for each frog.\n",
    "\n",
    "**b)** Compute the coefficient of variation of the impact forces *and* adhesive forces for each frog.\n",
    "\n",
    "**c)** Compute a data frame that has the mean, median, standard deviation, and coefficient of variation of the impact forces and adhesive forces for each frog.\n",
    "\n",
    "**d)** Now tidy this data frame. It might help to read [the documentation about melting](http://pandas.pydata.org/pandas-docs/stable/generated/pandas.melt.html)."
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