Increasing the number of securities in a portfolio reduces the unsystematic risk but not the systematic risk

Which of the following would be considered a business announcement?

a. a mass email informing customers that the company is moving to a new location b. a notice that the office Christmas party will be held in the conference room c. a statement that the company is changing its dress code d. All of the above

The probability of rejecting a null hypothesis when the null hypothesis is true is known as the:

A) confidence level. B) p-value. C) power of the test. D) significance level.