Answer:
The 80% confidence interval for the the population mean nitrate concentration is (0.144, 0.186).
Critical value t=1.318
Step-by-step explanation:
We have to calculate a 80% confidence interval for the mean.
The population standard deviation is not known, so we have to estimate it from the sample standard deviation and use a t-students distribution to calculate the critical value.
The sample mean is M=0.165.
The sample size is N=25.
When σ is not known, s divided by the square root of N is used as an estimate of σM:

The degrees of freedom for this sample size are:

The t-value for a 80% confidence interval and 24 degrees of freedom is t=1.318.
The margin of error (MOE) can be calculated as:
Then, the lower and upper bounds of the confidence interval are:

The 80% confidence interval for the population mean nitrate concentration is (0.144, 0.186).
Step-by-step explanation:
kfucmc!fxlkdf?c
Clc
c
<h3>ckmclc!fofloxldod</h3>
<span>It means that the point lies directly on the regression line.
</span>
Your answer is True!
Some other examples of an element in the set of natural numbers are 2, 3, 4, 5, etc.
Hope this helps you!
~sofia
X=3 or -3/4.<span>Îmi pare rău că nu mi-am arătat munca</span>