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3 cards from this section. Quick, good the night before a test.
Calculate the mean of the data set: 4, 6, 8.
Add the numbers and divide by how many numbers there are.
What is the deviation of 10 from the mean of 8?
Subtract the mean from the value.
What does variance measure?
Think about what variance is calculating in relation to the mean.
The standard deviation is the square root of which statistic?
Recall the relationship between these two concepts.
A group's test scores are: 12, 15, 14, 9, 18. Calculate the variance and standard deviation, indicating the consistency of the scores.
Calculate mean first, then follow through deviations and their squares.
Given a population data set of [100, 102, 98, 120]. Calculate variance and explain what it indicates about the population.
Find mean, calculate deviations and their squares before averaging.
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