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COM-211-1-INTRODUCTION TO DATA SCIENCE-Fall 2026

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True or False: if df is a dataframe, then the command

      df["ThisColumn"] = 50

will create the column "ThisColumn" in the dataframe, if it doesn't already exist. It will also set all of the

values in that column equal to 50.

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Which one or more of the following are the formal steps in Exploratory Data Analysis (EDA)?

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Which one or more of the following regex patterns will match the entire string:

abc123xyz

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You have read in the Iris data into a dataframe called irisDF.  The dataframe has columns that include: "sepal_length", "sepal_width", and "species".  There are 3 different species.  What will the following code will create?

for this_species in irisDF["species"].unique():

    plt.plot(irisDF.loc[irisDF["species"].str.match(this_species),"sepal_length"],

                 irisDF.loc[irisDF["species"].str.match(this_species),"sepal_width"])

plt.xlabel("sepal_length")

plt.ylabel("sepal_width")

plt.show()

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Given this dataframe called df, which command will retrieve "Tom" (and only "Tom")?

Data frame

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In a normal distribution, what percentage of the data will be found within 2 standard deviations of the mean?

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You have a dataframe with categorical data in a column that has some NaN's.  Assuming that the column does not already contain the value "Unknown", replacing the NaN's with the value "Unknown" is a reasonable approach.

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We can create a subset of data by using regex on categorical data using the Pandas .str.match() command

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Distributions with which type of kurtosis will most likely have more outliers than normal?

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You have this dataframe

called df:

                A       B

       0       1       4

       1       2       5

       2      3       6

After the operation

      b

= df + 5

b equals which of the

options below

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