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True experiments utilize comparison groups because they help reduce which of the following threats to internal validity?
Billboards
Large outdoor advertising structures typically found in high traffic areas, displaying advertisements to passing pedestrians and drivers.
Internet
A global network of computers and servers that enables the exchange of data, communication, and access to information.
Product Placement
A marketing strategy where branded goods or services are placed in a context usually devoid of ads, like movies or TV shows.
Product Advertisements
Marketing communications that promote and provide information about goods to entice potential buyers.
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