a) A researcher wishes to determine whether the salaries of professional nurses employed by private hospitals are higher than those of nurses employed by government owned hospitals She selects a sample of nurses from each type of hospital and calculates the means and standard deviations of their salaries At the 01 level of significance, test the claim that private hospitals pay more than government owned hospitals Assume both populations normal and the variances are equal

Private Gov ‘t

x1 = $26,800 x2 = $25,400

s 1 = $600 s2 = $450

n1 = 10 n2 = 8

claim ________________________

null hypothesis ________________________

alternative hypothesis ________________________

Calculator Screen Name ________________________

test statistic ________________________

pvalue/alpha comparison ________________________

decision ________________________

Conclusion ________________________

b) Construct a 99% confidence interval for µ1 ? µ2 based on the sample data above Interpret the interval in a complete sentence

Confidence Interval Name__________________________________

Interval___________________________________________

Interpret_____________________________________________