Chapter 7 - Estimating Parameters and Determining Sample Sizes

CI

________ for sigma or sigma squared: the population must have normally distributed values, even if the sample is large.

sample sizes

When dealing with unknown sigma when finding ________, sigma is about range /4 is a rule of thumb.

confidence interval estimate

When constructing a(n) ________ of a population standard deviation, we construct the confidence interval using the X squared distribution.

sample statistics

A critical value is the number on the borderline separating ________ that are significantly high or low from those that are not significant.

confidence interval

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

student t distribution

A(n) ________ is commonly referred to as a t distribution.