The manufacturer of electronic components needs to inform its buyers of the proportion of defective components in its shipments. The company has been stating that the percentage of defectives is 15%. A random sample of 86 items selected from a large shipment indicates 21 defectives. The manufacturer wants to find out if the proportion of defective components in this shipment is greater than the proportion that has been stated by the company. Specifically, they consider the following set of hypotheses:

H0: p=0.15

, Ha:p>0.15

,

whereprepresents the proportion of defective units in the shipment.

Step 1: Find the following statistics:

Group of answer choices

1. The sample proportion

2. The test statistic

3. The lower limit of a 95% confidence interval for the proportion