Determine the sample space for an experiment where a coin is selected from a bag two times. The two coins placed in the bag are a nickel (N) and a quarter (Q). Each time a coin is selected, it is replaced before selecting the next coin

The sample space for this experiment can be represented as follows:

{NN, NQ, QN, QQ}

where:
- NN represents selecting a nickel first and then a nickel again
- NQ represents selecting a nickel first and then a quarter
- QN represents selecting a quarter first and then a nickel
- QQ represents selecting a quarter first and then a quarter again

Therefore, the sample space for this experiment consists of four possible outcomes.