Perhaps the most successful way we've been able to use light to transfer information is fiber optics. ... Through rapid changes in the light, you can send highly complex signals down the cable. These are most often used either for high speed internet connections, or for sending sound signals to home theater systems.
What do you mean because the question is not here
Given that a directional hypothesis is a prediction made by a researcher regarding a positive or negative change, relationship, or difference between two variables of a population, a two-tailed test is the perfect tool to validate it because a two-tailed test is designed to examine both sides of a specified data range.
So the final answer to this question is:
True.
