Question 1131482
Assuming normality, s unbiased estimator of sigma, random sample, etc.
do 1 way
test stat is a t 
critical value is t0.975, df=5, t<2.571
calc is (x bar-mean)/s/sqrt (6)
this is -0.4/2.1/sqrt(6) =-0.47
fail to reject with insufficient evidence to support the claim at the 0.025 level