What is the relationship between the size of a confidence interval and its level of confidence (ex. 95% or 99%).

"The larger the interval, the more confident you are "

"Size of interval and confidence have nothing to do with eachother"

"The smaller the interval, the more confident you are"

"The larger the interval, the less confident you are"

"All intervals are the same size"

"The larger the interval, the more useful it is"