Define item difficulty and explain a common method for identifying challenging items.
Item difficulty is the percentage of students who answer an item correctly. A common method for identifying difficult items is to calculate the item facility index, which is the number of students who answered the item correctly divided by the total number of students who attempted the item.
Item difficulty is the number of students who guess the correct answer to an item. A common method for identifying difficult items is to calculate the item discrimination index, which compares the proportion of students who answered the item correctly to the proportion of students who guessed the correct answer.
Baroque art features strong contrasts, while Rococo art prefers more subtle transitions
Baroque art is generally larger in scale than Rococo art

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