A research project has been tracking the heah and cognitive functions of the elderly population in Arizona. The
table below shows the memory test scores from 16 elderly residents, tested first when they were 65 years old and again when they were 75 years old. The researcher wants to know if there is a significant decline in memory functions from age 65 to age 75 based on this sample. In other words, it is hypothesized that the memory score at age 75 is significantly lower than the memory score at age 65. So the null and aernative hypotheses should be directional. The alpha level was set at α = .05 for a one-tailed hypothesis test.