The Spinning Dancer (Or Silhouette Illusion) Is a Moving Image

Multiple Choice

The spinning dancer (or silhouette illusion) is a moving image of a woman that appears to be spinning. Some people see her spinning clockwise and some see her spinning counterclockwise. A student showed other students this and found that 30 out of 50 (or 60%) saw her spinning clockwise. The student researcher was interested in the probability of a randomly chosen student that would see the dancer spinning clockwise. He created the following null distribution for this. Using the information provided above, determine a 2SD confidence interval for the long-run probability a randomly chosen student would see the woman spinning clockwise. (Don't use any other applet to do this, just the applet output and information above.)

A) (0.36, 0.64)
B) (0.46, 0.74)
C) (0.53, 0.67)
D) (0.43, 0.57)