A researcher would like to determine the average mathematical skill level for freshmen entering the college. A sample of n = 30 freshmen is obtained and each person is given a standardized mathematics skills test. The researcher plans to use the sample data to estimate the mean score for the entire population of freshmen. Which estimation equation should the researcher use?
A) The single-sample t equation
B) The independent-measures t equation
C) The repeated-measures t equation
D) Cannot determine without additional information