Data Management Review
1. The following test marks were collected: 75, 68, 47, 55, 88, 76, 82,
73, 79, 80, 70, 64, 76, 55, 73, 76, 68.
Create a stem-and-leaf plot and calculate the mean, median, and mode.
Three students wrote the test late. Their marks were 98, 92, 94.
Did the new outliers affect the median more than the mean? What is
the best measure of central tendency for this data? Explain your
thinking.
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An outlier is an observation that lies an abnormal distance from other values in a random
sample from a population.
A data point that is distinctly separate from the rest of the data.
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2. Look at the following data about test scores: “Test 1 – 89%, Test 2 – 93%,
Test 3 – 97%.
Based on these test scores, what mark can I expect to get on Test 8?”
Justify your answer.
3. Make sure you know the measures of central tendency (Mean, Median,
Mode).
4. Understand how to draw a biased graph.
5. Drawing a line graph, stem and leaf plots and circle graphs.