A medical researcher wishes to see if hospital patients in a large hospital have the same blood type distribution as those in the general population. The distribution for the general population is as...

A medical researcher wishes to see if hospital patients in a large hospital have the same blood type distribution as
those in the general population. The distribution for the general population is as follows: type A, 20%; type B, 28%; type O,
26%; and type AB =26%. He selects a random sample of 50 patients and finds the following: 10 have type A blood, 10 have type
B, 23 have type O, and 7 have type AB blood.
alo
At a =0.05, can it be concluded that the distribution is the same as that of the general population? Use the critical value method
with tables.
what is the critical value and z value ?