Unit 8 Pt 2 Ap Stats

Ap Stats

Confidence Interval

A range of values that is used to estimate the true value of a population parameter.

Critical Value (z*)

A point on the standard Normal distribution that corresponds to a specified level of confidence.

Standard Error

An estimate of the standard deviation of the sampling distribution of a statistic.

Random Condition

The condition that states the sample must be a random sample from the population being studied.

10% Condition

A condition that states the sample size must be less than 10% of the population when sampling without replacement.

Large Counts Condition

A condition that requires both np and n(1-p) to be at least 10 for the sample size to be valid.

Sample Size (n)

The number of observations in a sample; important for estimating the population proportion with a specified margin of error.

Margin of Error (ME)

The range of values above and below the sample statistic in a confidence interval.

One-Sample Z Interval

A method for constructing a confidence interval for a population proportion using the standard normal distribution.

Population Proportion (p)

The true proportion of a particular characteristic in a whole population.

Table A

A reference table used to find critical values for different confidence levels.

Interpretation of Confidence Interval

Describing what the calculated interval means in the context of the data and inference.

Four-Step Process

A systematic method including State, Plan, Do, and Conclude used for constructing and interpreting confidence intervals.

Estimating Sample Size

The process of determining the number of observations required to achieve a desired level of precision in estimates.

Pew Research Center

An organization that conducts studies and reports on various social issues, including reading habits among American adults.