(a) The correct conclusion from the researcher's analysis is: • There is no correlation between shoe size and math ability.
(b) The conclusion that can be drawn from the grocery store's data is: • There is a correlation between amount of bread bought and amount of rice purchased. However, there is no causation. This is because there is an increase in the amount of rice purchased with a decrease in the amount of bread bought.
(c) Based on Ivanna's findings, she should say: • There is a correlation between height and serve speed. There may or may not be causation. Further studies would have to be done to determine this.