Question

LU Help System Announcements URCES Reserve Problems Chapter 10 Section 5 Problem 11 Following is a random sample of 15 measurements from high-flow rivers and 13 from low-flow rivers of a total algae concentration. on 5 on 6 High Low 23.3 18.4 23.8 59.6 33.6 37.0 40.0 47.3 56.0 34.1 78.8 33.3 17.8 55 31.0 43.1 23.4 26.0 49.5 41.8 67.0 38.7 75.8 12.2 43.9 16.4 48.4 56.4 Study Is there evidence to suggest that the standard deviations of the aglae concentration in the two types of rivers differ? Use a = 0.02. Round your answers to two decimal places (e.g. 98.76). Reject the null hypothesis if so < or fo> What is the test statistic? Round your answer to two decimal places (e.g. 98.76).

Answer 1

numerator df dN =n1-1=		14
denominator df dD=n2-1 =		12

for 2 % level and given df critical values of F      =0.263 & 4.05

reject the null hypothesis if fo <0.26 or fo >4.05

test statistic fo =(s1/s2)^2 =1.82