a) A researcher wishes to determine whether the salaries of professional nurses employed by private hospitals are higher than those of nurses employed by governmentowned 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_____________________________________________