Question 1193481
Ho: mean <=1.56
Ha: mean > 1.56
alpha=0.025 p{reject Ho|Ho true}
statistic is a t (0.975, df=9)
for a 1 way test, the critical value is t>2.262
mean is 1.778 l and s is 0.148 l
t=(1.56-1.778)/0.148/sqrt(10)
=-0.218*sqrt(10)/0.148
=4.658
reject Ho and the mean has increased.
p-value <0.001, actual is 0.0006