Question 463675
H[o]:{{{mu=86}}}
s=6
.
n=15, m=84
.
{{{t=(m-mu)/(s/sqrt(n))=(84-86)/(6/sqrt(15))=-1.29}}}

t [.005][14] = -2.977 two tailed
t[.01][14]=-2.64 one tailed
.
since t=-1.29>-2.977 and -2.64 then H[o] is not rejected. The manager's claim is accepted.
.
Ed