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bchamp2005p5upqx
17.06.2021 •
Mathematics
What is the image point of (-4,6)after the transformation
R y=x ° R180°?
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Ответ:
om this is so easy
Step-by-step explanation:
Ответ:
Since the Confidence is 0.90 or 90%, the value of
and
, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.05,39)".And we see that ![t_{\alpha/2}=1.68](/tpl/images/0553/0602/c2565.png)
Now we have everything in order to replace into formula (1):
So on this case the 90% confidence interval would be given by (4.90;8.23)
Step-by-step explanation:
Previous concepts
A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".
The margin of error is the range of values below and above the sample statistic in a confidence interval.
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
s=6.25 represent the sample standard deviation
n=40 represent the sample size
Solution to the problem
The confidence interval for the mean is given by the following formula:
In order to calculate the critical value
we need to find first the degrees of freedom, given by:
Since the Confidence is 0.90 or 90%, the value of
and
, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.05,39)".And we see that ![t_{\alpha/2}=1.68](/tpl/images/0553/0602/c2565.png)
Now we have everything in order to replace into formula (1):
So on this case the 90% confidence interval would be given by (4.90;8.23)