efer to the preceding question. What is the $95\%$ prediction interval, using the non$-$precise guidelines

discussed in the lecture, for the true cost when the number of direct labor hours is $15?$

a$.$ $$66\mathrm{.}40<$ the true cost $<$ $$93\mathrm{.}60$

b$.$ $$93\mathrm{.}60<$ the true cost $<$$$66\mathrm{.}40$

c$.$ $$47\mathrm{.}20<$ the true cost $<$ $$93\mathrm{.}60$

d$.$ Cannot be determined from the given information.

$5$