Data Preprocessing - 1

What does np.random.rand(2,3) generate?

• 2D array with random integers

• 2D array with random floats between 0 and 1

• 3D array with random integers

• Array with random Gaussian distribution

What does np.linspace(0, 10, 5) produce?

• Five evenly spaced numbers from 0 to 10

• Ten evenly spaced numbers from 0 to 5

• Sequence of integers

• None of the above

What is the output of np.eye(3)?

• 3×3 identity matrix

• 3×3 zero matrix

• 3×3 matrix of ones

• None of the above

Which NumPy method is used to check for NaN values?

• np.isnan()

• np.isnull()

• np.missing()

• np.check_nan()

Which NumPy function is used to compute the cumulative sum?

• np.cumsum()

• np.sum()

• np.add()

• np.total()

In NumPy, axis=1 in a sum function means:

• Sum across columns

• Sum across rows

• Sum diagonally

• Sum all elements

Which function is used to write a DataFrame to a CSV file?

• to_csv()

• write_csv()

• save_csv()

• export_csv()

What does df.head(3) do?

• Returns first 3 rows

• Returns last 3 rows

• Returns first 3 columns

• Returns first 3 values

Which pandas function resets the index of a DataFrame?

• reset_index()

• drop_index()

• clear_index()

• set_index()

Which function gives the count of non-null values per column?

• count()

• len()

• non_null()

• notnull()