A medical researcher suspects that the variance of the pulse rate of smokers is higher than the variance of the pulse rate of non-smokers. Use the sample statistics below to test the researcher?s suspicion. Use ? = 0.05.

H ₀ =

H _A =

a. Degrees of freedom for the numerator _____ degreees of freedom for the denominator_______

b. Critical value F ₀ = _________ rejection region __________

c. Test statistic F = __________

d. Reject or fail to reject the null hypothesis _______

Smokers n=61 $1=7.8 Non-smokers n=121 $2=5.3 o 2 1 so 2 2 o 2 1 so 2 2