=+13. Deliveries. The clothing company in Exercise 11a looks at a sample of delivery reports. They test the hypothesis that 90% of the deliveries are on time against the alternative that greater than 90% are on time and find a P-value of 0.22. Which of these conclusions is appropriate?

a) There’s a 22% chance that 90% of the deliveries are on time.

b) There’s a 78% chance that 90% of the deliveries are on time.

c) There’s a 22% chance that the sample they drew shows the correct percentage of on-time deliveries M10_SHAR8696_03_SE_C10.indd 353 14/07/14 7:31 AM 354 CHAPTER 10 Testing Hypotheses about Proportions