Stats 1.2 Simple random sampling

simple random sample

a sampling procedure for which each possible sample of a given size is equally likely to be the one obtained.

Name two methods for obtaining information

sampling and experimentation

what are the two types of simple random sampling?

simple random sampling with replacement and simple random sampling without replacement

simple random sampling with replacement

whereby a member of a population can be selected more than once

simple random sampling without replacement

whereby a member of the population can be selected at most once

There are 90 students in a lunch period, and 55 of them will be selected at random for cleaning duty every week. Each student receives a number 01-90 and the school uses a random digit table to select a simple random sample of 55 students. Which 55 students should be assigned cleaning duty? 06915 72954 10167 12142 26492

06,57,29,54,10

Mr. Thompson runs his own printing and bookbinding business. He suspects that the machine isn't putting enough glue into the book spines and decides to inspect his most recent order of 70 textbooks to test his theory. He numbers them 01-70 and, using the random digit table printed below, selects a simple random sample of 55 books to check. Which books are in the sample below? 81232 43939 84583 23840 05995

23,24,39,58,32

There are 90 students in a lunch period, and 55 of them will be selected at random for cleaning duty every week. Each student receives a number 01-90 and the school uses a random digit table to select a simple random sample of 55 students. Which 55 students should be assigned cleaning duty? 24709 73698 14526 31893 32592

24,70,36,14,52