critical value
Multiplier that makes a confidence interval wide enough to have the stated capture rate. The critical value depends on both the confidence level C and the sampling distribution of the statistic.
margin of error
The difference between the point estimate and the true parameter value will be less than the margin of error in C% of all samples, where C is the confidence level.
one-sample z interval for a proportion
Confidence interval used to estimate a population proportion.
confidence interval
Gives an interval of plausible values for a parameter. The interval is calculated from the data and has the form point estimate � margin of error or, alternatively, statistic � (critical value) ? (standard deviation of statistic)
confidence level C
Success rate of the method for calculating the confidence interval. In C% of all possible samples, the method would yield an interval that captures the true parameter value.
point estimate
Specific value of a point estimator from a sample.
point estimator
Statistic that provides an estimate of a population parameter.
Random condition
A condition for performing inference, which requires that the data come from a random sample from the population of interest or from a randomized experiment.
Normal/Large Sample condition
A condition for performing inference about a mean, which requires that the data come from a Normally distributed population or that the sample size is large (n ? 30 ).
one-sample t test for a mean
A test of the null hypothesis that a population mean is equal to a specified value.
standard error
When the standard deviation of a statistic is estimated from data, the result is the standard error of the statistic.