Talking about sample size Which of the following is needed for a sample size

Question

Talking about sample size,

Which of the following is needed for a sample size

calculation?

a. What variable you will measure

b. Desired potential for a Type 1 error

c. Knowing if it will be a random sample

d. The size of the population from which you will collect your random sample

Which of the following is true about sample size?
Statistics and Probability