=+10.70 Optical fibers are used in telecommunications to transmit light. Current technology allows production of fibers that transmit light about 50 km (Research at Rensselaer, 1984). Researchers are trying to develop a new type of glass fiber that will increase this distance. In evaluating a new fiber, it is of interest to test H0

: m 5 50 versus Ha

: m . 50, with m denoting the true average transmission distance for the new optical fiber.