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Stanley conducts a study in which he assesses teasing in a sample of first-graders during the first week of school and again three months later. Because the study is longitudinal, Stanley has to worry about which of the following threats to internal validity?
Market Interest Rates
The prevailing rates at which borrowers can obtain loans and lenders can earn interest in the financial markets, influenced by monetary policy, market demand, and economic conditions.
Premium
An amount paid in addition to a standard rate or principal, often associated with insurance policies or bond prices over par value.
Discount
A reduction applied to the price of goods, services, or securities, either for promotional purposes or to reflect the present value of future cash flows.
Future Cash Flows
The amount of money, both incoming and outgoing, that is expected to be generated or expended in the future.
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