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.
Successful tuberculosis treatment depends on close cooperation between patient and healthcare provider. In most cases, proper treatment with the right antibiotics for the right amount of time will cure tuberculosis (TB). Treatment for tuberculosis is usually at least 6 months in duration. Sometimes treatment takes as long as 12 months. This is because there are many bacteria that need to be killed. Treatment also involves taking several different antibiotics.