Question 1183970
The half interval  is t(0.95, df=27)* sqrt (s1^2/n1+s2^2/n2)
=1.703*sqrt((1.86^2/15)+(1.91^2/14))
=1.703*0.700
=1.19
The point estimate of the difference is 13.06 Hz
so the interval is (11.87 Hz, 14.25 Hz)