a. A null hypothesis is a hypothesis tested in significance testing.

b. The parameter of a null hypothesis is commonly 0.

c. The aim of all research is to prove the null hypothesis is true

d. Researchers can reject the null hypothesis if the P-value is above 0.05

**a. A null hypothesis is a hypothesis tested in significance testing.**

*b. is false because a parameter can be anything we choose it to be*

c. is false because our aim is to disprove or fail to reject the null hypothesis

d. is false since a p-value

c. is false because our aim is to disprove or fail to reject the null hypothesis

d. is false since a p-value

__below__0.05 is often the rejection level.