Which of the following sampling methods are biased? systematic random sample

voluntary response sample

convenience sample

simple random sample

- voluntary response sample

- convenience sample

Step-by-step explanation:

Any method of sampling can be biased depending on how they are cared out; however, both voluntary response and convenience are almost always biased. This is because in both the sample is not controlled. In voluntary response, there is no way to ensure that the sample will be representative of everyone since it is based on volunteers. Convenience is also biased because the sample is skewed towards whatever is convenient not what is fair and representative.

-4

step-by-step explanation:

(-4+8)=-(4-8)=-8+4=-4

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons