x 2 sum - The total of each value in the x column squared and then added together. y 2 sum - The total of each value in the y column squared and then added together. N - The total number of elements (or trials in your experiment).
Patients with tuberculosis of the lungs have a prolonged illness with fever, cough, night-sweats, weight loss and may occasionally cough up blood. As the disease progresses, symptoms get worse and shortness of breath ensues. Untreated disease can be fatal.
Though conventional tuberculosis is highly treatable and curable (with a 90 percent rate of success), TB kills more people worldwide in a typical year, according to the Global TB Report Card, than all wars, earthquakes, floods, tsunamis, airline accidents, terrorist attacks, and murders combined.he World Health Organization reports that TB infects one new person every second and is the world's leading killer of women. An ancient disease, tuberculosis has been found in the skulls and spinal cords of Egyptian mummies 3,000 years old.