What is meant by the term "90% confident" when constructing a confidence interval for a mean?

90% confidence means that, if repeated samples were taken and the 90 percent confidence interval was computed for each sample, 90 percent of the intervals would contain the population mean. A 90 percent confidence interval has a 0.90 probability of containing the population mean. This means that 90 percent of the population distribution is contained in the confidence interval.

Line the mark up so you will find your answer

The correct answer would be "convenience"