A computer manufacturer estimates that it's cheapest screens will last less than 2.8 years. A random sample of 61 of these screens has a mean life of...

A computer manufacturer estimates that it's cheapest screens will last less than 2.8 years. A random sample of 61 of these screens has a mean life of 2.5 years. The population is normally distributed with a population standard deviation of 0.88 years. At a=0.02, what type of test is this and can you support the organization's claim using the test statistic?