An article in the ASCE Journal of Energy Engineering ("Overview of Reservoir Release Improvements at 20 TVA Dams," Vol. 125, April 1999, pp. 1-17) presents data on dissolved oxygen concentration from streams below 20 dams in the Tennessee Valley Authority system. The sample mean from the observations equals 3.234 and the sample standard deviation is s = 2.121.

a) Calculate the 95% two-sided prediction interval on the dissolved oxygen concentration for the next stream that will be tested. (rounded to two decimal places)

95% confidence interval: (2.241,4.227)

Step-by-step explanation:

We are given the following in the question:

Sample mean, = 3.234

Sample size, n = 20

Alpha, α = 0.05

Sample standard deviation, σ = 2.121

95% confidence interval:

Putting the values, we get,  

(2.241, 4.227) is the required confidence interval.

what? ?

what type of question is thiss

step-by-step explanation:

the sum of the lengths of any two sides of a triangle is greater than the length of the third side. if you take the three sides of a triangle and add them in pairs, the sum is greater than (not equal to) the third side. if that is not true, then it is not possible to construct a triangle with the given side lengths.

step-by-step explanation: