Contents
Why should the sum of the probabilities in a probability?
Answer: Probability is a number that can be assigned to outcomes and events. The sum of the probabilities of all outcomes must equal 1 . Two events A and B are independent if knowing that one occurs does not change the probability that the other occurs.
Can you have a negative probability?
The probability of the outcome of an experiment is never negative, although a quasiprobability distribution allows a negative probability, or quasiprobability for some events. These distributions may apply to unobservable events or conditional probabilities.
Students realize that there is an equally likely chance for any number to be generated by any spin, toss, or key press. In Samples and Populations, students realize that these numbers may be used to select members of a population to be part of a sample.
How are bivariate data used in mathematical models?
In Mathematical Models students collect two-variable (bivariate) data. The data collected, and the purpose for their use, influence subsequent phases of the statistical investigation. The concepts of numerical and categorical data are introduced in the Grade 6 Unit, Data About Us.
Why is variability at the heart of statistical reasoning?
Understanding variability, the way data vary, is at the heart of statistical reasoning. Variation is understood in terms of the context of a problem because data are numbers with a context.
What kind of data is used in statistical analysis?
Sample data might be numerical or categorical, univariate or bivariate. Knowing the type of data helps us to determine the most appropriate measures of center and variability, and make choices of representations. The primary purpose of statistical analysis is to provide an accounting of the variability in collected data.