You are analyzing financial data with R. The variable data is a vector containing the amount of money in several bank accounts in 2020. Your friend mentions that all accounts received a $1,000 stimulus check during the pandemic. How can you update the existing variable?

Question

BlackTom AI · Accepted Answer

We’re working with a vector of monetary balances and want to reflect each account receiving a $1,000 stimulus by updating the existing variable in place.
Option 1: 'data = data + 1' would add 1 to each element, not 1000, so this does not represent the stimulus amount.
Option 2: 'data2 = data + 1000' creates a new variable data2 containing the original data plus 1000, but it does not update the existing data vector in place, which fails to meet the requirement of updating the existing variable.
Option 3: 'data = data + 1000' adds 1000 to every element of data, correctly reflecting the stimulus across all accounts and updating the original variable directly.
Option 4: 'data2 = 1000 * data' scales each balance by 1000, which is far larger than a $1,000 addition and does not represent a fixed stimulus amount.
Option 5: 'data = 1000' replaces the entire vector with a single value of 1000, losing the individual account amounts and not applying a uniform $1,000 addition to each account.
In summary, only the third option accomplishes the intended in-place update by adding exactly 1000 to every element of the existing vector, while the others either add a different amount, create a new variable, apply a scaling factor, or overwrite the data inappropriately.

You are analyzing financial data with R. The variable data is a vector containing the amount of money in several bank accounts in 2020. Your friend mentions that all accounts received a $1,000 stimulus check during the pandemic. How can you update the existing variable?单项选择题

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