Isabel owns a T-shirt cart and has a contract with a local sports arena to distribute T-shirts outside the venue. Isabel is paid
1 answer:
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Answer:
Step-by-step explanation:
Required
15 is what percentage of 105
To do this, simply divide 15 by 105 multiplied by 100%.
So, we have:
--- approximated
Answer:
673 people
Step-by-step explanation:
Statistics<3
Use the margin of error formula.
ME = t*
- Margin of error or ME = 3
- Critical t or t* with a confidence level of 95% on the calculator is invNorm(.975) = 1.96. You would use invt, except you don't have the degrees of freedom, so you can approximate with invNorm. It's close enough.
- Standard deviation or s = 39.7
- Solve for n!
3 = 1.96*
3/1.96 =
1.531 =
39.7/1.531 =
25.937 =
25.937^2 = ^2
672.7 = n
You need at least 673 people to be confident!