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What is standard deviation? Why is it important in statistics? Why would someone use standard deviation to describe a data set?

I want to collect data on everyone’s favorite model of cars. Which measure of central tendency can be used?

Consider the following two groups. Are these two groups significantly different? (Hint: I give you the SEM, but to compare significance, you need to increase your confidence interval and then compare;)) Group 1:  mean = 5.2, SEM = 0.4 Group 2:  mean = 7.2, SEM = 1.0

A pulseless 6-week-old infant arrives to the emergency department, and high-quality CPR is in progress.  The initial rhythm strip is shown below. EKG pe(1).png   CPR continues, and vascular access has been established.  What is the next appropriate intervention?

An 8-year old child had a sudden onset of palpatations and light-headedness.  At the time of the evaluation the child is alert.  His respiratory rate is 26/min., and his blodd pressure is 104/70 mm Hg.  A cardiac monitor is applied, and the rhythm below is noted. ekg svt.png  What is  the most appropriate intervention?

The exercise of therapeutic privilege straightforwardly violates which principle of Biomedical Ethics:

An 8-year-old child was struck by a car. He arrives in the emergency department alert, anxious, and in respiratory distress. His cervical spine is immobilized, and he is receiving a 10-L/min flow of 100% oxygen by nonrebreathing face mask. His respiratory rate is 60/min, heart rate 150/min, systolic blood pressure 70 mm Hg, and SpO2 84%. Breath sounds are absent over the right chest but present over the left chest, and the trachea is deviated to the left. He has weak central pulses and absent distal pulses. Which intervention should be performed next?

For a 6-month-old infant with supraventricular tachycardia and adequate peerfusion, which of the following is the prefered vagal maneuver?

Kwashiorkor is a disease caused by malnutrition, primarily due to a lack of protein in the diet. It is often seen in starving children and characterized by a swollen belly. The low amount of protein in the blood causes water to leave the bloodstream and instead enter the tissues, causing edema or swelling. Therefore, the osmolarity in the blood in reference to the osmolarity of tissues would be considered which of the following?  

Jorge is waiting in line at the Department of Motor Vehicles (DMV). His wait time of 32 minutes is in the 85th percentile of wait times. Is that good or bad? Write a sentence interpreting the 85th percentile in the context of this situation.