Reconsider the previous exercise on age and BMI.
a. Determine a 95% confidence interval for the population slope and interpret what this interval represents.
b. Based on your confidence interval, is there strong evidence for a positive association between age and BMI? Explain.
c. Based on a one-sided p-value, is there strong evidence for a positive association between age and BMI? Explain.
d. Your answers to parts (b) and (c) might contradict each other. Explain why that is.

Data from previous exercise

Researchers in a clinical study collected information from their subjects at the beginning of the study. Two of the variables were body mass index (BMI) and age. We are interested in seeing if there is an association between these two variables. Th e data from the study can be found in the file AgeBMI.