7.22

A given population proportion is 0.25. For the given value of n, what is the probability of getting each of the following sample proportions?

a) n = 110 and

b) n = 33 and

 

 

a) n = 110 and

            p = 0.25

 

 

 

 

 

For a z-value of -0.97, Table A.5 gives a probability of 0.3340, which is the area between the sample proportion 0.21 and the population proportion 0.25. Therefore: