Interactive Statistics Q.13.3

Real 13.3) During World War II, there was a scarcity of foods rich in fat (meat, butter, eggs, etc.) in Data Norway (and other countries). Along with a decline in the consumption of fat, a decline in the death rate from atherosclerosis was also observed. (Atherosclerosis is the formation of fatty deposits on the walls of the arteries, which can lead to heart disease or stroke. ) The following table gives the consumption of fat in kilograms per year per person (x) and the number of deaths from atherosclerosis per 100,000 people in a year (y) for Norway from 1938 to 1947: Year 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 Rate (x) 14.4 16.0 11.6 11.0 10.0 9.6 9.2 10.4 11.4 12.5 Deaths (y) 29.1 29.7 29.2 26.0 24.0 23.1 23.0 23.1 25.2 26.1 (a) Produce a scatterplot. Circle the observation corresponding to the year 1940. (b) What is the equation of the least squares regression line of y on x? (c) If the consumption of fat were 13 kilograms per year per person, what would be the estimated annual death rate (for Norway) due to atherosclerosis