A hospital wishes to estimate the average number of days required to treatment of patients between the ages of 25 to 34 years. A sample study of 500 hospital patients between these ages produced a mean of 5.4 days and a standard deviation equal to 3.1 days. Assuming normality, construct an interval of 95% confidence ance for medium length length of stay for the patient population from which the sample.
Suppose here that
S2 = n112-1 (X; - X)"). Σ in = X n