# Sampling Lab

The purpose of this laboratory exercise is to familiarize yourself with the different sampling
techniques.

You need one page from a movie listing (like contained in TV-Guide). Note, if you actually use
TV Guide®, then you need to use two facing pages. Pick a page with little extraneous material,
other than the listings, on it.

For the purposes of this sampling project, a movie is included on the page or in a cluster if the
running time for the movie falls on the page.

### Random Sampling

Number each movie on the page. If there are a lot of movies, you may wish to number every
other or every third movie.

Generate a random sample on 8 numbers between 1 and the number of movies on the page. Write
down the # generated and the running time for the movie corresponding to that number.

### Systematic Sampling

Generate a random number between 1 and 6. Beginning with the movie corresponding to that
number, and then taking every 6th movie thereafter, write the # of the movie and the running
length of the movie.

### Convenience Sampling

Write down the running time of the first eight movies.

### Stratified Sampling

On a separate piece of paper, write down the running times of all PG/PG13, R, and not-rated
(either NR or no rating given) movies in three columns -- ignore all other types (NC17, G, etc).
Split a sample of 8 proportionally to each type of movie (if R is 40%, then sample 40% of 8 = 3.2
-> 3 R movies). Use random sampling within each movie type. Record the running lengths of the
movies selected.

### Cluster Sampling

Divide the page into equal regions so that each region has roughly 3 - 4 movies in each cluster.
Randomly select 3 clusters, and record the running length of all movies in those clusters.

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