When performing a hypothesis test for the difference between the means of two independent populations where the standard deviations are known, it is necessary to use the pooled standard deviation in calculating the test statistic

Just In Thyme, Inc., has the following year-end shareholders' equity balances: Common Stock of $20,000; Paid-in Capital in Excess of Par of $30,000; and Retained Earnings of $50,000. If Just In Thyme repurchases $10,000 of its stock, the total shareholders' equity balance would equal ______.

a. 90000 b. 70000 c. 80000 d. 60000

Using both a firewall and host hardening to protect a host is ________

A) defense in depth B) risk acceptance C) an anti-weakest link strategy D) adding berms