Farmers in northern Sweden sell one of the most expensive cheeses in the world, which is made from moose milk. Suppose a random sample of female moose was obtained, and the weight of each was measured (x, in kilograms). The amount of milk produced by each moose in one day was also measured (y, in liters). MOOSE
a. Construct a scatter plot for these data.
b. Find the estimated regression line. Add a graph of the estimated regression line to the scatter plot in part (a).
c. Complete the ANOVA summary table, and conduct an F test for a significant regression. Use a significance level of 0.05.
d. Remove the first observation, a possible outlier, from the data set. Find the new estimated regression line. Is this new regression significant at the 0.05 level?
Fragments of protein waste, beta amyloids, may be a reliable marker in Alzheimer’s disease (AD) patients. Recent studies suggest that these protein fragments accumulate in the brain and form hard plaques, which are found in many AD patients. However, as omega-3 intake increases, there is some evidence to suggest that the beta amyloid blood level decreases.38 Suppose a study was conducted to investigate this relationship. A random sample of adults was obtained, the amount of omega-3 that each consumed in a day (x, in mg) was estimated, and the beta amyloids 40 level ( y, in pg/ml) was measured for each.