The first quartile (Q 1) is defined as the middle number between the smallest number and the median of the data set.The second quartile (Q 2) is the median of the data. Use the median to divide the ordered data set into two halves. 2  If the median is a datum (as opposed to being the mean of the middle two data), include the median in both halves. 3  The lower quartile value is the median of the lower half of the data.
Many people associate shaky hands with Parkinsonâs disease, but the most common cause of shaking hands is actually essential tremor. Essential tremor is the most common neurologic disorder affecting adults, but itâs not well understood.
Causes. Numbness in a hand is usually caused by damage, irritation or compression of one of the nerves or a branch of one of the nerves in your arm and wrist. Diseases affecting the peripheral nerves, such as diabetes, also can cause numbness, although this is often preceded by similar symptoms in your feet.Rarely, numbness can be caused by problems in your brain or spinal cord, although this is usually accompanied by weakness or loss of function in your arm or hand.iseases affecting the peripheral nerves, such as diabetes, also can cause numbness, although this is often preceded by similar symptoms in your feet. Rarely, numbness can be caused by problems in your brain or spinal cord, although this is usually accompanied by weakness or loss of function in your arm or hand.