A researcher tested 23 older adults and 23 younger adults on their ability to remember a list of words. For each participant in each group, the researcher counted the number of words correctly recalled. HYPOTHESIS The research hypothesis is that age predicts memory performance. This hypothesis is

Research Hypothesis : 'Age predicts  memory performance' is ALTERNATE HYPOTHESIS

Explanation:

Hypothesis is a rational proposition , tested for its truth validity. It is usually used to test the relationship between two variables

Null Hypothesis is a neutral hypothesis of no difference, stating no relationship between the studied variables.

Alternate Hypothesis is an effect based hypothesis , stating relationship between the studied variables.

Example : Given Case - Studying age relationship with memory ; implies following hypothesis