Find the annual simple interest rate if: I=$60 , P=$500 , and t=3 years.
1 answer:
You might be interested in
Keywords:
<em>Pair of numbers, negatives, law of signs, multiply </em>
For this case we must say that it is obtained by multiplying any even number of negative numbers, that is, if a positive or negative number is obtained.
We must bear in mind that the Law of Signs states that:
For example:
Let -a, -b, -c, -d negative numbers, we have:
- A pair:
- Two pairs:
This is true for the multiplication of any pair of negative numbers.
So, the answer is: You get a positive number
Answer:
A positive number is obtained
<h3>Answer: 8.323 (approximate)</h3>
====================================================
Explanation:
s = 32 = sample standard deviation
n = 40 = sample size
Despite not knowing the population standard deviation (sigma), we can still use the Z distribution because n > 30. When n is this large, the student T distribution is approximately the same (more or less) compared to the standard Z distribution. The Z distribution is nicer to work with.
At 90% confidence, the z critical value is roughly z = 1.645. This can be found using either a Z table or a calculator.
------------------
We have these values:
- z = 1.645 (approximate)
- s = 32
- n = 40
Plug these values into the margin of error formula.
The margin of error is roughly 8.323
I rounded to 3 decimal places because z = 1.645 is rounded to 3 decimal places. If your teacher wants some other level of precision, then be sure to follow those instructions.