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4 cards from this section. Quick, good the night before a test.
Define population and sample in your own words.
Think about a classroom versus a school.
What is the purpose of descriptive statistics?
Consider how you might explain the main points of data to someone.
What is a population in statistics?
Think about who is included in your survey.
True or False: A sample is always a perfect representation of the population.
Consider sampling errors or biases.
A civil engineer is trying to estimate average water pressure in pipelines across a city. If she takes samples from 100 homes and finds an average of 55 psi with a standard deviation of 10 psi, how confident can she be in this sample's representation of the greater city population?
Consider the role of sample size and randomness.
Given the following set of sensor data on material strain: 5, 10, 15, 20, calculate the mean, median, standard deviation, and detect any outliers.
Apply proper formulas for calculating each measure.
6 more questions in this section. Enroll free to practise them all.
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