Question

1. Use the following information for the next two problems. A researcher is studying bacterial contamination in grocery-store chickens. She purchases 400 broiler chickens from various kinds of stores in several states and tests them for common types of bacteria that cause food-borne illnesses. She finds that 180 of the chickens are infected with such bacteria.

   Calculate a 95% confidence interval to estimate the proportion of all broiler chickens that are infected.

   	a.	0.401 to 0.499
   	b.	0.415 to 0.485
   	c.	0.377 to 0.523
   	d.	0.426 to 0.474

5 points   

QUESTION 16

1. If we increase the confidence level (from 95% to 99%) then the overall length of the new confidence interval is __________ the interval in the previous problem.

   	a.	shorter than
   	b.	longer than
   	c.	the same length as

Answer 1