We are planning an experiment comparing three fertilizers. We will haveExercise 7.2 six experimental units per fertilizer and wi
ll do our test at the 5% level. One of the fertilizers is the standard and the other two are new; the standard fertilizer has an average yield of 10, and we would like to be able to detect the situation when the new fertilizers have average yield 11 each. We expect the error variance to be about 4. What sample size would we need if we want power .9
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Let the length be 
and the width be 
. Now, write the length in terms of the width. "The length is 15 cm. less than twice the width" in the form of an equation is
Let's plug that into the equation for the perimeter now. The perimeter of a rectangle is
, so the equation for the perimeter of this rectangle is
Plugging in the length in terms of width and solving for the width, we get
To find the length, we just have to plug in the width into the equation we wrote for the length in terms of the width:
Let's plug that into the equation for the perimeter now. The perimeter of a rectangle is
Plugging in the length in terms of width and solving for the width, we get
To find the length, we just have to plug in the width into the equation we wrote for the length in terms of the width:
Let the total money earned be x
since each of them get equal share, therefore :
And here, we used <u>Total earning</u> as the variable in the problem ~
So, correct choice is D