DPDD Y1 Revision 2

What is the primary purpose of data cleaning in data management?

• To increase the size of the dataset

• To remove inaccuracies and inconsistencies

• To add more variables

• To visualise data

Which of the following is a common method for visualising time series data?

• Bar chart

• Line graph

• Pie chart

• Histogram

In a bar chart, what does the height of each bar represent?

• The frequency or value of the category

• The time interval

• The colour of the category

• The width of the category

Which Python library is commonly used for creating scatter plots?

• NumPy

• Matplotlib

• SciPy

• Seaborn

What is the function used to calculate the mean in a Pandas DataFrame?

• `df.mean()`

• `df.average()`

• `df.mode()`

• `df.median()`

Which of the following is a customisation option available in Matplotlib?

• Changing the font size

• Adding a watermark

• Exporting to Excel

• Running SQL queries

What is the purpose of the `dropna()` function in Pandas?

• To add missing values

• To remove missing values

• To sort the DataFrame

• To merge DataFrames

Which function in Pandas is used to read a CSV file into a DataFrame?

• `pd.read_csv()`

• `pd.load_csv()`

• `pd.import_csv()`

• `pd.open_csv()`

What is the median of the following dataset: [3, 7, 9, 15, 21]?

• 7

• 9

• 15

• 21

Which of the following is a data generation technique?

• Data cleaning

• Data augmentation

• Data visualisation

• Data deletion