Question

Assume researchers are trying to find out the mean concentration levels of a specific drug in a population of individuals’ blood during a clinical trail. The researchers find that the sample population n= 100 has a mean concentration of 225 ng/mL with a standard deviation of 47 ng/mL. Calculate a 95% confidence interval for the mean concentration level of the medication for the population’s blood and interpret it.

[1] The researchers are 95.0% confident the true mean concentration of medication in the population’s blood is between 215.79 ng/mL and 234.21 ng/mL.

[2] The researchers are 95.0% confident the true mean concentration of medication in the population’s blood is between 200 ng/mL and 300 ng/mL.

[3] The researchers are 95.0% confident the true mean concentration of medication in the population’s blood is between 132.88 ng/mL and 317.12 ng/mL.

[4] The researchers are 95.0% confident the true mean concentration of medication in the population’s blood is between 147.69 ng/mL and 302.32 ng/mL.

Answer 1