its about statistics

 When we construct or design a test of hypotheses, we define a null hypothesis and alternative hypothesis. 

    What is the rationale behind each of these two types of hypotheses?   What is each intended to convey?

2. Words are very important when crafting statements for hypothesis testing. 

    Briefly describe a real-world situation that might be aided by a hypothesis test.

    Craft the relevant null hypothesis and alternative hypothesis for this test.