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jimena15
26.06.2020 •
Mathematics
In a random sample of 7 residents of the state of Maine, the mean waste recycled per person per day was 1.4 pounds with a standard deviation of 0.23 pounds. Determine the 95% confidence interval for the mean waste recycled per person per day for the population of Maine. Assume the population is approximately normal. Step 1 of 2 : Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.
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Ответ:
The Confidence desired is 0.95 or 95%, then the significance is
and
, and the critical value in the t distribution with 6 degrees of freedom would be ![t_{\alpha/2}=2.447](/tpl/images/0694/4462/40cd7.png)
The 95% confidence interval for the true mean would be between (1.187;1.613)
Step-by-step explanation:
Information given
s=0.23 represent the sample standard deviation
n=7 represent the sample size
Confidence interval
The confidence interval for the mean is given by the following formula:
The degrees of freedom are given by
The Confidence desired is 0.95 or 95%, then the significance is
and
, and the critical value in the t distribution with 6 degrees of freedom would be ![t_{\alpha/2}=2.447](/tpl/images/0694/4462/40cd7.png)
Now replacing we got:
The 95% confidence interval for the true mean would be between (1.187;1.613)
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