Determination of Sample Sizefor Estimating Means (6)• Example 6.7.1– A health department nutritionist, wishing to conduct asurvey among a population of teenage girls to determinetheir average daily protein intake (measured in grams),is seeking the advice of a biostatistician relative to thesample size that should be taken.– What procedure does the biostatistician follow inproviding assistance to the nutritionist? Before thestatistician can be of help to the nutritionist, the lattermust provide three items of information: (1) the desiredwidth of the confidence interval, (2) the level ofconfidence desired, and (3) the magnitude of thepopulation variance.