Mathematics · Statistics Essentials

Mathematics — Statistics Essentials

Review descriptive statistics, variation, probability rules, z-scores, and the shape of a normal distribution.

20 cardsHigh school / introductory universityFoundational

A focused review

Topics covered

statisticsdescriptive statisticsprobabilitymeanmedianstandard deviation

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Showing 5 of 20

Question 01What is the difference between a population and a sample?

Answer

A population is the full group of interest; a sample is a subset observed from that group.

Question 02What does a statistic describe?

Answer

A numerical summary calculated from sample data; a parameter describes a population.

Question 03What is the arithmetic mean of a data set?

Answer

The sum of the observations divided by the number of observations.

Question 04How is the median found?

Answer

Order the observations and take the middle value, or the mean of the two middle values when there is an even count.

Question 05What is the mode of a data set?

Answer

The value or values that occur most often; a data set can have more than one mode or none.

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