Chapter 6 & 7 Probability Flashcards
Define:
Random Sampling
Each individual has an equal opportunity of being selected
What is the definition of probability in equation form?
Probability of A= # of outcome classified as A/ total # of possible outcomes
Define:
Sampling Error
The natural discrepancy, or amount of error, between a sample statistic and its corresponding population parameter
Define:
Distribution of Sample Means
The collection of sample means for all possible random samples of a particular size (n) that can be obtained from a population
Define:
Sampling Distribution
A distribution of statistics obtained by selecting all the possible samples of a specific size from a population
Define:
Central Limit Theorem
A precise description of the distribution that would be obtained if you selected every sample, calculated every sample mean, and constructed the distribution of the sample
Define:
Expected Value of M
When the mean of the distribution of sample means is equal to the population mean
Define:
Standard Error of M
The standard deviation of the distribution of a sample mean
What is the equation for the standard error of M?
σM=σ/√n
Define:
Law of large numbers
The larger the sample size (n), the more probable it is that the sample mean will be close to the population mean
How is standard deviation different from standard error of the mean (M)
Standard deviation is the standard distance between a score and the population mean. Whereas the standard error of M measures the amount of difference between the sample mean and population mean
What is the equation of the z score corresponding to the sample mean?
Z= Μ-μ/σΜ
What is the equation of the z score corresponding to the single score?
Z= Μ-μ/σ
