Let’s put it all together.
You teacher will give you a paper that lists a data set with 100 numbers in it. Explain whether each method of obtaining a sample of size 20 would produce a random sample.
Option 1: A spinner has 10 equal sections on it. Spin once to get the row number and again to get the column number for each member of your sample. Repeat this 20 times.
Option 2: Since the data looks random already, use the first two rows.
Option 3: Cut up the data and put them into a bag. Shake the bag to mix up the papers, and take out 20 values.
Option 4: Close your eyes and point to one of the numbers to use as your first value in your sample. Then, keep moving one square from where your finger is to get a path of 20 values for your sample.
Continue working with the data set your teacher gave you in the previous activity. The data marked with a star all came from students at Springfield Middle School.
Using only the values you computed in the previous two activities, compare your sample to your partner’s.
Is it reasonable to conclude that the measures of center for each of your populations are meaningfully different? Explain or show your reasoning.
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