Hope Student Researchers Want to Determine If Students Yawning (When

Multiple Choice

Hope student researchers want to determine if students yawning (when being yawned at) is asso-ciated with the time of day (morning, afternoon, and evening) . They found the following results when they yawned in front of people around campus:

• Morning: 25 of the 39 people yawned
• Afternoon: 15 of the 38 people yawned
• Evening: 29 of the 44 people yawned
-Follow-up confidence intervals for all pairwise differences in proportions are as follows:
•0.0299 to 0.4627: Morning - Afternoon
•-0.2237 to 0.1876: Morning - Evening
•-0.4736 to -0.0551: Afternoon - Evening
Based off of these intervals, which of the following conclusions are correct?

A) The probability of yawning in the morning differs significantly from the probability of yawning in the evening.
B) The probability of yawning in the morning differs significantly from the probability of yawning the afternoon.
C) The probability of yawning in the afternoon does not differ significantly from the probability of yawning in the evening.
D) The probability of yawning in the morning does not differ significantly from the probability of yawning in the afternoon.