Question 1187211
the difference is a t-test with t(df=8, 0.975) = 2.306 assuming an alpha=0.05
x bar=48.89
s=5.06
t=difference in means/s/sqrt(n)
=3.89*sqrt(9)/5.06
=2.306
reject at the 5% level, p-value is 0.05005
the question says 0.05, and that is the above.