BST322 Week4 Dis1

Q1 Correlation between coffee and cholesterol

A study from a Colombian research center is about to publish a pilot study regarding a new coffee plant that they believe can reduce total cholesterol in humans. They gave increasing doses (cups of coffee) to a test patient over several weeks and recorded the following data:

caffeine (mg)Cholesterol level (mg/dL)10068420054730020040039950041560040070058

Evaluate the claim that the caffeine from this new plant reduces cholesterol by plotting caffeine levels (x) versus the cholesterol levels (y).

1. What is the correlation coefficient r and what does it mean in this case?
2. What is the coefficient of determination and what does it mean in this case?
3. Is there a statistically significant correlation between caffeine intake and cholesterol levels in this case?

Click on the link below for help with how to do a Simple Regression and r value test in StatCrunch:

http://youtu.be/1hKMCOihumc