I have questions regarding the homework, and I wonder if you could help me with descrpitions or further information,

1. If the population distribution of scores is normally distributed, you can use the unit normal table to determine the probability of getting a z score. However, in order to use the table correctly you must know when a problem is asking for a "tail probability" or a "body probability." As indicated in the reading, you should sketch a normal curve, locate the z score, and shade the area under the curve (the probability) that the question is asking for. If the shaded area in your sketch is larger than half of the curve use the _______ of the unit normal table. Answer: body column or tail column?

2. Next, Dr. Gatz tested Henry's ability to identify simple line drawings of objects. In the adult population, the parameters were = 10; = 0.89. Henry named 7 objects correctly. Use a z score to determine the proportion of people in the adult population that scored better than Henry on this object-naming test. Assume that the population of object-naming scores on this test is normally distributed.

3. How can you use the frequency distribution histogram (i.e., the normal curves you drew above) to determine which of the extraversion scores are most rare? Select all that apply. 1. Scores that are the farthest from the mean are the most rare. 2. Negative z scores are more rare than positive z scores. 3. The height of the curve above a given score reflects how rare that score is; the lower the curve line,