Memory loss may be partly explained by the gradual loss of brain cells that begins in early adulthood and causes an approximately ___% reduction in brain weight by age 80

Dr. Wozniak is examining a cell from the nervous system of an animal. He notices that at one end of the cell body is a long, fibrous strand of tissue. He immediately recognizes this as an axon that is responsible for ____.?

a. ?carrying signals away from the cell body b. ?receiving signals from other cells and carrying them toward the cell body c. ?determining the speed at which an action potential will travel d. ?determining whether the cell inhibits or excites neighboring neurons

A sample of n = 4 scores is obtained from a population with ? = 70 and ? = 8. If the sample mean corresponds to a z-score of 2.00, then what is the value of the sample mean?

A) ?M = 86 B) ?M = 78 C) ?M = 74 D) ?M = 72