Chapter 19

Question 1

Standard error

Answer 1

When we estimate the standard deviation of a sampling distribution using statistics found from the data.

Question 2

Confidence interval

Answer 2

A level C confidence interval for a model parameter is an interval of values usually of the form found from the data in such a way that C% of all random samples will yield intervals that capture the true parameter value.

Question 3

One-proportion z-interval

Answer 3

A confidence interval for the true value of a proportion. The confidence interval is where z* is a critical value from the Standard Normal model corresponding to the specified confidence level.

Question 4

Margin of error

Answer 4

In a confidence interval, the extent of the interval on either side of the observed statistic value. Typically the product of a critical value from the sampling distribution and a standard error from the data.

Question 5

Critical value

Answer 5

The number of standard errors to move away from the mean of the sampling distribution to correspond to the specified level of confidence.