For a set of values of x and y, if Pearson's Correlation r is equal to - 0.97, it means:

a. x and y are positively and strongly correlated

b. x and y are negatively and strongly correlated

c. x and y have no relationship

d. x and y are perfectly correlated

11. Some researchers believe that consuming fish high in omega-3 fatty acids can help prevent memory loss in the elderly. Imagine that a researcher designed such a study on 300 seniors in assisted living facilities. He recorded the amount of fish high in omega-3 fatty acids they consumed in the previous month and their memory test scores. He hypothesized that elders who consumed more of this kind of fish would have better memory test scores.

Which kind of graph can the best portray this relationship:

a. histogram of the amount of fish consumed

b. Frequency distribution graph of the memory test scores

c. Stem and leaf graph

d. Scatter Plot