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RichardKing2376
19.03.2020 •
Mathematics
The number of square feet per house is normally distributed with a population standard deviation of 154 square feet and an unknown population mean. If a random sample of 16 houses is taken and results in a sample mean of 1550 square feet, find a 80% confidence interval for the population mean. Round your answer to TWO decimal places. z0.10 z0.05 z0.025 z0.01 z0.005 1.282 1.645 1.960 2.326 2.576 You may use a calculator or the common z values above.
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Ответ:
The 80% confidence interval for the population mean is between 1500 square feet and 1600 square feet.
Step-by-step explanation:
We have that to find our
level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of
.
So it is z with a pvalue of
, so ![z = 1.282](/tpl/images/0554/8431/ec05c.png)
Now, find M as such
In which
is the standard deviation of the population and n is the size of the sample.
The lower end of the interval is the sample mean subtracted by M. So it is 1550 - 50 = 1500 square feet.
The upper end of the interval is the sample mean added to M. So it is 6.4 + 1550 + 50 = 1600 square feet.
The 80% confidence interval for the population mean is between 1500 square feet and 1600 square feet.
Ответ:
answer:
the answer is b
step-by-step explanation: