What is standard deviation in AP Psychology?

Standard Deviation. A statistical measure of the amount of dispersion in a set of scores. Specifically it is the square root of the average squared deviations from the mean of a set of scores.

What are inferential statistics AP psychology?

Inferential Statistics. Make inferences and draw conclusions based on data. Help psychologists decide whether they can generalize (apply) samples to the general population. Statistical Significance.

What is the Flynn Effect AP Psych?

The Flynn effect is the trend that there is an increase in intelligence testing scores over time. The average intelligence score in the 1940s is lower than the average intelligence score in 2019.

What is central tendency psychology?

the middle or center point of a set of scores. The central tendency of a sample data set, for instance, may be estimated by a number of different statistics (e.g., mean, median, mode).

Why is standard deviation used in psychology?

Three standard deviations account for 99% of the sample population being studied, assuming the distribution is normal (bell-shaped). In addition to expressing the variability of a population, standard deviation is commonly used to measure confidence in statistical conclusions.

What is central tendency in psychology?

Central tendency is a statistical measure that identifies a single score as representative of an entire distribution. The goal of central tendency is to find the single score that is most typical or most representative of the entire group.

What is Z score in psychology?

A z-score describes the position of a raw score in terms of its distance from the mean, when measured in standard deviation units. The z-score is positive if the value lies above the mean, and negative if it lies below the mean.

What is a positive skew in psychology?

When a distribution has a few extreme scores toward the high end relative to the low end (e.g., when a test is difficult and few test takers do well), it has a positive skew (or is positively skewed), such that the mean is greater than the mode.

Which situation is an example of using inferential statistics?

Inferential statistics have two main uses: making estimates about populations (for example, the mean SAT score of all 11th graders in the US). testing hypotheses to draw conclusions about populations (for example, the relationship between SAT scores and family income).