Question

Economists compared the results of auctioning identical pairs of Pokémon cards on eBay. One card in each pair had a secret reserve price, and the other had a public reserve price (minimum bid). [Source: Katkar, R., & Reiley, D. H. (2006). Public versus secret reserve prices in eBay auctions: Results from a Pokémon field experiment. Advances in Economic Analysis & Policy, 6(2), Article 7.]

For a sample of Pokémon cards, data were collected on the following variables:

•	Reserve Type (0 = public, 1 = secret)
•	Reserve Amount (in dollars)
•	Sold (0 = did not sell, 1 = sold)
•	Highest Bid (in dollars)
•	Selling Price (in dollars)

Recognizing the measurement scale of the data collected on each variable is important because the type of data dictates the appropriate data summary methods and statistical procedures.

Which variable(s) in the data set are interval variables ?

A. Reserve Amount, Highest Bid, and Selling Price

B. Reserve Amount

C. None of the variables

D. Highest Bid and Selling Price

Answer 1