Total plasma volume is important in determining the required plasma component in blood replacement therapy for a person undergoing surgery. Plasma volume is influenced by the overall health and physical activity of an individual. Suppose that a random sample of46male firefighters are tested and that they have a plasma volume sample mean ofx=35ml/kg(milliliters plasma per kilogram body weight). Assume that=8.00ml/kgfor the distribution of blood plasma.

When finding an97% confidence interval, what is the critical value for confidence level? (Give your answer to two decimal places.)

z_c=

(a)Find a97% confidence interval for the population mean blood plasma volume in male firefighters.

What is the margin of error? (Round your answers to two decimal places.

)lower limit

upper limit

margin of error(

(b)What conditions are necessary for your calculations? (Select all that apply.)

the distribution of weights is normal

distribution of weights is uniform

nis large

is known

is unknown

(c)Interpret your results in the context of this problem.

We are 97% confident that the true average blood plasma volume in male firefighters falls within this interval.

We are 3% confident that the true average blood plasma volume in male firefighters falls within this interval.

The probability that this interval contains the true average blood plasma volume in male firefighters is 0.97.

The probability that this interval contains the true average blood plasma volume in male firefighters is 0.03.(d)Which equation is used to find the sample sizenfor estimatingwhenis known?

(d)Which equation is used to find the sample size n for estimating when is known?

Find the minimal sample size necessary for a97% confidence level with maximal margin of errorE=2.00for the mean plasma volume in male firefighters. (Round your answer to a whole number.) male firefighters