Which of the following algebraic expressions will translate “the sum of eight and twice w”?
2 answers:
Answer:
None of the choices are correct.
Step-by-step explanation:
In order to correctly translate the sum of eight and twice "w" we have to remember that every time that an algebraic problem refers to twice something we have to multiply that by 2, so the sum of eight and twice W should look like this:
So since that is not in the options, none of the options are correct.
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We need to find out how many adults must the brand manager survey in order to be 90% confident that his estimate is within five percentage points of the true population percentage.
From the given data we know that our confidence level is 90%. From Standard Normal Table we know that the critical level at 90% confidence level is 1.645. In other words, .
We also know that E=5% or E=0.05
Also, since, is not given, we will assume that
=0.5. This is because, the formula that we use will have
in the expression and that will be maximum only when
=0.5. (For any other value of
, we will get a value less than 0.25. For example if,
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and thus,
.).
We will now use the formula
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which can approximated to n=271.
So, the brand manager needs a sample size of 271