A researcher in sports equipment is investigating the design of racing swimsuits for women. The researcher selected a samp The difference in the sample mean swim times will be calculated. Which of the following is the appropriate inference procedure for analyzing the results?

A two-sample t-interval for a difference between sample means
A two-sample t-interval for a difference between population means
A one-sample t-interval for a sample mean
A one-sample t-interval for a population mean
A matched pairs t-interval for a mean difference