Representation Intermediate Quiz 2
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Quiz 2
1. In R, what does the function merge() do?
Combines vectors into a matrix
Joins two data frames by common columns or keys
Converts a data frame to a list
2. In spreadsheets, what does the INDIRECT function do?
Sums all referenced cells automatically
Converts text to numbers
Returns a cell reference specified by a text string
3. In R, what is a factor used for?
To represent categorical data with fixed levels
To store only numeric vectors
To combine two data frames
4. In spreadsheets, what does the PMT function calculate?
The principal amount of a loan
The payment for a loan based on interest rate, periods, and amount
The total interest paid only
5. In R, what does the function table() do?
Converts a vector to a data frame
Creates a plot
Counts the frequency of each unique value in a vector
6. In spreadsheets, what is the difference between COUNT, COUNTA, and COUNTIF?
COUNT counts numeric cells, COUNTA counts all non-empty cells, COUNTIF counts cells meeting a condition
All three functions do the same thing
COUNT counts text, COUNTA counts numbers, COUNTIF counts blank cells
7. In R, which function can you use to combine multiple data frames by rows?
merge()
rbind()
c()
8. In spreadsheets, which chart type is best suited for showing parts of a whole?
Line chart
Scatter plot
Pie chart
9. In R, what does the subset parameter drop = FALSE do when selecting columns?
Drops unused factor levels
Prevents R from converting the result into a vector, keeping it as a data frame
Deletes missing values
10. In spreadsheets, what does the REPLACE function do?
Replaces part of a text string with a new string
Finds a value in a range
Splits a cell into multiple rows
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