Final answer:
The 'study period' is used in the annual worth method to assess the viability of an investment when indefinite repetition of alternatives is unjustified, incorporating expected rate of return, risk, and actual rate of return.
Step-by-step explanation:
The statement 'The study period can also be used for the annual worth method if the assumption of being able to indefinitely repeat the choice of alternatives is not justified' refers to a financial analysis approach in investment decision-making. This approach takes into account the expected rate of return, the associated risk, and the actual rate of return to determine the feasibility of a project or investment. For instance, when calculating the payback period for an investment in insulation, one would consider the cost of energy, the cost of insulation per square meter, and the average temperature difference during the heating season to estimate the time needed for savings to offset the initial investment.