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Probability refers to the likelihood of an event occurring. It can be expressed as a number (0.5) or a percentage (50%). Statistical tests allow psychologists to work out the probability that their results could have occurred by chance, and in general psychologists use a probability level of 0.05.
Probability theory is the branch of mathematics that deals with chance and uncertainty. It forms an important part of the foundation for statistics, because it provides us with the mathematical tools to describe uncertain events.
and Odds Key Vocabulary † outcome † event † sample space † probability † odds A possible result of an experiment is an outcome. For instance, when you roll a number cube there are 6 possible outcomes: a 1, 2, 3, 4, 5, or 6. An event is an outcome or a collection of outcomes, such as rolling an odd number. The
1 of the counters is pink. 4 of the counters are black. The rest of the counters are purple. Carter takes a counter at random from the bag. Show that the probability that the counter is white or purple is 3. V 4. Question 10: There are only pink, yellow, green and blue counters in a bag. The table shows the probability that a counter taken at ...
Learn statistics and probability for free, in simple and easy steps starting from basic to advanced concepts. The field of statistics is concerned with collecting, analyzing, interpreting, and presenting data.
- A p-value less than 0.05 (typically ≤ 0.05) is statistically significant. It indicates strong evidence against the null hypothesis, as there is les...
- A z-score describes the position of a raw score in terms of its distance from the mean when measured in standard deviation units. It is also known...
- The independent variable is the variable the experimenter manipulates or changes and is assumed to have a direct effect on the dependent variable....
- Quantitative data is numerical information about quantities and qualitative data is descriptive and regards phenomena that can be observed but not...
Statistics worksheets including collecting and organizing data, measures of central tendency (mean, median, mode and range) and probability.
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Learn statistics and probability—everything you'd want to know about descriptive and inferential statistics.
