STAT 1350: Elementary Statistics
Lab Activity #4
Name(s)_________________________
Simple Random and Stratified Random Sampling Date
___________________________

A Simple Random Sample

The college believes that 55% of the student body resides on campus. Use
the random number table (attached) to randomly select 10 students. Label
the sampling frame using two digit numbers.

1. Pick a simple random sample of 10 students.

a. Describe the procedure:

STEP 1:

STEP 2:

Started at row _______________________ of Table A.

b. List the 10 students. Indicate whether the student resides on
campus or commutes to campus.

|Student Number |Resides or |Student Number |Resides or |
| |Commutes | |Commutes |
| | | | |
| | | | |
| | | | |
| | | | |
| | | | |

c. What percentage of your SRS are residential students?

Does this support the college\'s belief? Explain.

Stratified Simple Random Sample

2. Pick a stratified sample, by type of student (residential or commuter).
Select 10 students from each stratum.

a. Describe the procedure:

STEP 1:

STEP 2:

Started at row _______________________ of Table A.

b. List the 20 students

|Student Number |Resides or Commutes |Student Number |Resides or Commutes |
| | | | |
| | | | |
| | | | |
| | | | |
| | | | |
| | | | |
| | | | |
| | | | |
| | | | |
| | | | |

Sampling Frame

The following sampling frame represents the student body at a small liberal
arts school in central Ohio. The white shapes represent resident students
and the shaded shapes represent students who commute to campus.

Sampling Frame

The following sampling frame represents the student body at a small liberal
arts school in central Ohio. The white shapes represent resident students
and the shaded shapes represent students who commute to campus.

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