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.
You usually feel sick. Your doctor will do special tests to find where TB is harming your body. You canât spread TB to other people. If the TB germs are in your lungs, you can spread TB to other people by coughing, sneezing, talking, or singing.