8.3.pptx

Confidence Interval

An interval estimate of a population parameter that is likely to contain the actual parameter value with a specified level of confidence.

Critical Value

A point in a statistical distribution that is used to define the boundaries of a confidence interval.

Random Condition

The condition that requires sample data to be collected using a random sampling method.

10% Condition

A condition stating that the sample size should be less than 10% of the total population when sampling without replacement.

Normal/Large Sample Condition

The condition that requires either a normally distributed population or a sample size of 30 or more for using t-distribution.

One-Sample t Interval

A confidence interval for a single population mean when the population standard deviation is unknown, using the t-distribution.

t-distribution

A type of probability distribution that is used in statistics for estimating population parameters when the sample size is small and/or the population standard deviation is unknown.

Degrees of Freedom (df)

A parameter used in various statistical tests that represents the number of values in the final calculation of a statistic that are free to vary.

Margin of Error

The maximum amount by which the sample estimate may differ from the true population parameter.

Standard Deviation of the Statistic

A measure of the amount of variation or dispersion of a set of values, regarding the sample mean.

One-Sample Z Interval

A confidence interval for a population mean when the population standard deviation is known, using the z-distribution.

Estimation of Population Mean (µ)

The process of using sample data to calculate an interval that likely contains the true mean of a population.

Sample Size Determination

The process of calculating the number of observations required to achieve a specific confidence level and margin of error.

Boxplot

A graphical representation that shows the distribution of a dataset through its quartiles.

Histogram

A graphical representation of the distribution of numerical data, showing frequency counts for intervals.

Stemplot

A tool for displaying quantitative data in an organized manner, separating each value into a stem (leading digits) and leaf (trailing digits).