In 36 randomly selected seawater samples, the mean sodium chloride concentration was 23 cubic centimeters per cubic meter. Assume the population standard deviation is 6.7 cubic centimeters per cubic meter.

Construct the 90% and 95% confidenceintervals for the population mean.

90% confidence interval for population mean =(21.163, 24.837)

95% confidence interval for population mean =(20.811, 25.189)

Step-by-step explanation:

Confidence interval for population mean () is given by :-

, where n= sample size, z= critical z-value , = sample mean = population standard deviation.

Given : n= 36 ,   cubic centimeters per cubic meter.

cubic centimeters per cubic meter

For 90% confidence level , z= 1.645 [by z-table]

Then, required interval for population mean () would be :

For 95% confidence level , z= 1.96 [by z-table]

Then, required interval for population mean () would be :

Hence, 90% confidence interval for population mean =(21.163, 24.837)

95% confidence interval for population mean =(20.811, 25.189)

the correct answer is b. negative exponential growth.

step-by-step explanation:

you can tell it's an exponential function because it decreases rapidly then levels out and never touches the x-axis.

it is negative because the y-axis decreases as the x-axis increases.

therefore it is a negative exponential growth graph.

hope i !

idk

step-by-step explanation: