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sierravick123owr441
27.06.2020 •
Mathematics
A random sample of 130 students is chosen from a population of 4,500 students. The mean IQ in the sample is 120, with a standard deviation of 5. Using a margin of error of 1.13%, what is the 99% confidence interval for the students' mean IQ score?
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Ответ:
Step-by-step explanation:
Information given
s=5 represent the sample standard deviation
n=130 represent the sample size
For this case we can't set a margin of error just with a % since they not specify 1.13% respect to something for this case we can omit this value
Confidence interval
The confidence interval for the mean is given by the following formula:
The degrees of freedom are given by:
The Confidence level is 0.99 or 99%, the significance would be
and
, and the critical value would be ![t_{\alpha/2}=2.614](/tpl/images/0696/1651/a7b5a.png)
And replacing we got:
Ответ:
answer:
8$?
Step-by-step explanation:
Well the question didn't say anything of how much Nancy is selling to people and the exact amount of items she sells.