The Following Display from a TI-84 Plus Calculator Presents a 95

Multiple Choice

The following display from a TI-84 Plus calculator presents a 95% confidence interval for the difference between two means. The sample sizes are $n _ { 1 } = 8 \text { and } n _ { 2 } = 13$ $\text { Compute the point estimate of } \mu _ { 1 } - \mu _ { 2 } \text {. }$

A) 123.288
B) 40.864
C) 42.032
D) -1.557