The __________ is a widely used technical indicator that oscillates between 0 and 100 based on the price movement of the underlying security or index.

B. Relative Strength Index

A. Lower Support Line

D. Dividend growth expectation

C. Bollinger Bands

Calculate the sample standard deviation of returns for a stock with annual returns of 62.7%, 88.1%, -3.8%, 18.0%, and -42.2%. The value is closest to __________.

C. 42.0%

A. 22.0%

B. 32.0%

D. 51.0%

As the correlation coefficient between two securities changes in a portfolio __________.

D. neither expected return nor risk change

B. only expected return changes

C. only risk changes

A. both expected return and risk change