Python for Data Analysis: Step-By-Step with Projects - Modifying Values

What is the primary focus of this lesson on data frames?

• Modifying values within data frames

• Loading data into data frames

• Visualizing data frames

• Deleting data frames

Which method is used for label-based indexing in pandas?

• index

• filter

• iloc

• loc

How can you change all occurrences of a specific value in a column?

• Using a for loop

• Using the replace method

• Using Boolean indexing and loc

• Using the drop method

What happens if you try to add a new row using iloc?

• It duplicates the last row

• It replaces the first row

• It throws an error

• It adds the row successfully

How can you convert a column's measurement from centimeters to feet?

• Add 0.0328084

• Multiply by 0.0328084

• Subtract 0.0328084

• Divide by 100

Which method helps in selecting columns of a specific data type?

• pivot

• groupby

• select_dtypes

• filter

What is the result of multiplying all numeric columns by 100?

• It divides each element by 100

• It multiplies each element by 100

• It changes the data type

• It adds 100 to each element

What is the purpose of the select_dtypes method?

• To merge two DataFrames

• To sort the DataFrame

• To select columns based on data type

• To select rows based on conditions

What is the formula to calculate BMI in the given context?

• Weight in kg divided by height in meters

• Weight in kg divided by the square of height in meters

• Height in meters squared divided by weight in kg

• Height in meters divided by weight in kg

How do you add a new column to a DataFrame?

• Use the append method

• Assign a new series to a new column name

• Use the merge method

• Use the drop method