A Company Believes That It Controls More Than 30% of the Total

Multiple Choice

A company believes that it controls more than 30% of the total market share for one of its products.To prove this belief, a random sample of 144 purchases of this product is contacted.It is found that 50 of the 144 purchases were of this company's brand.If a researcher wants to conduct a statistical test for this problem, the observed z value would be _______.

A) 0.05
B) 0.103
C) 0.35
D) 1.24
E) 1.67