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 purchased this company's brand of the product.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