Excel VBA Research & Evidence-Based Practice 4

Question 1

A VBA macro must calculate the standard deviation of a research sample (not population). Which WorksheetFunction should be used?

Accepted Answer

StDev

Answer

WorksheetFunction.StDev calculates sample standard deviation (n-1), appropriate for sample-based research data.

Question 2

When running a VBA analysis macro on a large research dataset, which property should be set to False to improve performance?

Accepted Answer

Application.ScreenUpdating

Answer

Setting Application.ScreenUpdating = False prevents Excel from refreshing the display during the macro, significantly speeding up execution.

Question 3

To store intermediate research calculation results efficiently in memory without writing to the worksheet, a VBA developer should use a:

Accepted Answer

Module-level variable array

Answer

A module-level variable array holds data in RAM for fast access during computation, avoiding repeated slow worksheet reads.

Question 4

Which VBA statement correctly reads all values from a worksheet range into an array for batch processing?

Accepted Answer

Dim arr() As Variant: arr = Range("A1:A100").Value

Answer

Assigning a multi-cell Range's .Value to a Variant array loads all values at once, far faster than cell-by-cell access.

Question 5

A researcher needs to find the correlation coefficient between two data columns using VBA. Which WorksheetFunction provides this?

Accepted Answer

WorksheetFunction.Correl

Answer

WorksheetFunction.Correl(array1, array2) returns the Pearson correlation coefficient between two data arrays.

Excel VBA Practice Test