In a sample of 42 water specimens, 26 were found to have contamination. Find a 90% confidence interval for the population proportion of contaminated specimens . What is the UPPER BOUND? ______________________________ Note: Enter XXX.X X AT LEAST ONE DIGIT BEFORE THE DECIMAL, TWO AFTER and round up. Thus, 134.784 is entered as 134.78, 35.295 is entered as 35.30, .2749 is entered as 0.27, -.5650 is entered as -0.57