Can u guys please do the congruent question d
1 answer:
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Answer:
The standard deviation of the sample mean differences is _5.23_
Step-by-step explanation:
We have a sample of a population A and a sample of a population B.
For the sample of population A, the standard deviation is
The sample size is:
.
For the sample of population B, the standard deviation is
The sample size is:
.
Then the standard deviation for the difference of means has the following form:
Finally
The calculations for 2, 4, 8 year can be derived as follows,
For simple interest:
S.I =
P= principle
T= Time
R= Rate
For 2 year;
S.I = = $224
Amount = $2224
For 4 year;
S.I = = $448
Amount = $2448
For 8 year;
S.I = = $896
Amount = $2896
This is a polynomial of degree 2, and remember that complex roots always come in pairs; therefore, in a second degree polynomial you can only have 0 real roots and 2 complex roots, or 2 real roots and 0 complex roots. There is no way you can have 1 real root and 1 complex root because, as stated before, complex (non-real) roots always come in pairs; so the only way of having 1 real root is dumping the polynomial of degree 2 (
) by changing the 14 to 0. That way we'll left with 
which only has one real root:
