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.
With latent TB: 1  You cannot spread TB to other people. 2  In some people, the bacteria can become active. If this happens, you may become sick, and you can pass the TB germs to someone else. 3  Even though you do not feel sick, you need to take medicines to treat latent TB for 6 to 9 months. This is the only way to make sure all of the TB bacteria in your body are killed. When you have active TB, you may feel sick or have a cough, lose weight, feel tired, or have a fever or night sweats.