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3 cards from this section. Quick, good the night before a test.
What is the formula for calculating standard deviation for a sample?
Remember, you're dividing by n - 1 for samples.
Define standard deviation in your own words.
Think about variability and spread.
What does a high standard deviation indicate about a dataset?
Think about how scores might vary.
True or False: A standard deviation of zero means all data points are identical.
Reflect on what it means for values to not vary.
Given a dataset of temperatures recorded over a week: {70, 72, 68, 75, 65, 80, 78}, compute the standard deviation. Discuss what this could indicate about temperature consistency.
Calculate the mean first, then the variance, before taking the square root.
You are comparing the performance of two different sales teams. Team A has monthly sales figures of {2000, 2200, 1800, 1900, 2100}, while Team B has figures of {3000, 2900, 3100, 3300, 3200}. Calculate the standard deviation for both teams and discuss which team performed more consistently.
Remember to consider the implications of higher and lower standard deviations.
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