Two shooters, rodney and philip, practice at a shooting range. they fire 100 rounds each at separate targets. the targets are marked with circles and each bullet hitting a particular circle gets them a particular number of points. 50 rounds are selected at random. the sample mean scores of rodney and philip are 9 and 7, respectively. and, their variances are 0.25 and 0.36, respectively. the standard error of the difference between their mean scores is

i think the answer to your question is b. directive

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.