A Researcher Is Estimating the Average Difference Between Two Population

Multiple Choice

A researcher is estimating the average difference between two population means based on matched?pairs samples. She gathers data on each pair in the study resulting in: Assume that the data are normally distributed in the population. To obtain a 95% confidence interval, the table t value would be ___.

A) 2.132
B) 1.86
C) 2.306
D) 2.976
E) 2.776