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5 cards from this section. Quick, good the night before a test.
Calculate the mean of the dataset: 2, 4, 6, 8, 10.
Add all the numbers and divide by the total count.
What is the variance for the sample data: 1, 2, 3?
Remember to average the squared deviations from the mean.
What does standard deviation measure?
Think about which term relates to dispersion or spread.
True or False: Variance can be negative.
Consider what happens when you square a negative number.
You are given the following set of scores: 5, 6, 8, 10, and 12. Calculate the variance and standard deviation of this dataset. Provide your reasoning and steps.
Follow the formula for variance closely!
Consider the grouped data below with frequencies: Class 10-20 (3), Class 20-30 (4), Class 30-40 (5). Calculate the mean and standard deviation.
Make sure to find class midpoints before calculating anything!
6 more questions in this section. Enroll free to practise them all.
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