Percentages & Selective Data Flashcards

All 3 cards in this deck

What is the formula for percentage change?

percentage change = (change ÷ original value) × 100. Always divide by the starting value.

What does the 90th percentile of a data set tell you?

90% of the values in the data set lie below it.

True or false? Showing only part of a time series can hide a longer-term trend.

True. Selecting a short period can make a rise or fall look typical when the full record shows otherwise.