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megaboy
27.06.2020 •
Mathematics
Suppose that textbook weights are normally distributed. You measure 33 textbooks' weights, and find they have a mean weight of 75 ounces. Assume the population standard deviation is 13.3 ounces. Based on this, construct a 99% confidence interval for the true population mean textbook weight. Round answers to 2 decimal places.
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Ответ:
And the 95% confidence interval would be between (69.027;80.793)
Step-by-step explanation:
Information given
n=33 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 level is 0.99 or 99%, the significance would be
and
, the critical value for this case would be ![z_{\alpha/2}=2.58](/tpl/images/0696/0888/0d14c.png)
And replacing we got:
And the 95% confidence interval would be between (69.027;80.793)
Ответ:
2nd Bubble
Step-by-step explanation:
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