I am having a bit of a problem with this one. Any help will be appreciated.
A clothing retailer believes that 35% of its customers are between the ages of 20 and 30. A survey of 150 of its customers showed 55 between the ages of 20 and 30. At a 0.10 level of significance, what is the test value? What is the critical value? And Does the data show a contradiction to the retailer's belief?
This is what I have:
p=x/n=55/150=0.366 (0.37) p=0.35 q=1-0.35=0.65
z=p-p/sq. rt. pq/n= 0.37-0.35/sq tr. (0.35)(0.65)/150=