basic stat psychology
it covers z tests and inferential statistics.
a.) state the difference between a type i error and type ii error
b.) define the following in a sentence or two:
i.) p-value
ii.) statistical power
c.) when conducting statistical hypothesis tests, when would you use the following
i.) non-directional hypothesis
ii.) directional hypothesis

a.Starting on a platform 2 feet above sea level, dive down to a location that is 18  feet below sea level, and then rise 8 feet.

Step-by-step explanation:

The first number (2) is positive and represents the height above the sea level that the scuba diver started. So, options c) and d) are incorrect.  

If the (-20) represent s the position (-20) feet below the sea, as stated in option b), then, the position (+8) will represent that the scuba diver will be 8 feet above the sea level in the next position, which has no sense.

Therefore, option a) is the correct one.