Question

In a college population of 10,000 people, suppose you want to randomly pick a sample of 1000 for a survey. For any particular sample of 1000, if you are sampling with replacement,
what is the chance of picking the first person .
 what is the chance of picking a different second person . and lastly, what is
 the chance of picking the same person again. please help me, i think i can do the first one.

Answer 1

here is the answer . how did they get it
in a college population of 10,000 people, suppose you want to randomly pick a sample of 1000
for a survey. For any particular sample of 1000, if you are sampling with replacement,
the chance of picking the first person is 1000 out of 10,000 (0.1000);
the chance of picking a different second person for this sample is 999 out of 10,000 (0.0999);
the chance of picking the same person again is 1 out of 10,000 (very low).
If you are sampling without replacement,
the chance of picking the first person for any particular sample is 1000 out of 10,000 (0.1000);
the chance of picking a different second person is 999 out of 9,999 (0.0999);
you do not replace the first person before picking the next person.
Compare the fractions 999/10,000 and 999/9,999. For accuracy, carry the decimal answers to 4 place decimals.

Answer 2

http://cnx.org/content/m16014/1.14/

Answer 3

im not sure how they got , the chance of picking a second different person