The article “gas cooking, kitchen ventilation, and exposure to combustion products” reported that for a sample of 50 kitchens withgas cooking appliances monitored during a one-week period, the sample mean co2level(ppm) was 654.16, and the sample standard deviation was 164.43.(a) calculate and interpret a 95% confidence interval for true average co2level in thepopulation of all homes from which the sample was selected.(b) suppose the investigators had made a rough guess of 175 for the value ofsbeforecollecting data. what sample size would be necessary to obtain an interval widthof 50 ppm for a confidence level of 95%?

(b) 240

step-by-step explanation:

first, we use the pythagorean formula using the given side lengths to find x. then we use x to find the side lengths. then we add the side lengths to find the perimeter.

pythagorean theorem formula:

a^2 + b^2 = c^2

(x - 20)^2 + (x - 40)^2 = x^2

x^2 - 40x + 400 + x^2 - 80x + 1600 = x^2

x^2 -120x + 2000 = 0

(x - 100)(x - 20) = 0

x - 100 = 0 or x - 20 = 0

x = 100 or x = 20

we see that the solution x = 20 must be discarded because it will give a negative side length and a side length of 0. the only valid solution is x = 100.

perimeter = sum of the lengths of the sides

perimeter = x + x - 20 + x - 40

perimeter = 3x - 60

replace x with 100.

perimeter = 3(100) - 60

perimeter = 300 - 60

perimeter = 240

idk

step-by-step explanation:

step-by-step explanation: