Question 1148877
Mean is 59/12=4.916667
s=1.62
Ho: IQ<=4
Ha:IQ>4
alpha=0.05 p{reject Ho|Ho true}
test statistic is t df=11 =(x bar-mean)/s/sqrt(n)
critical value t>1.796
calculation is t=(0.916667)/1.62/sqrt(12))=1.96
reject Ho and IQ >4
p-value 0.038