9.3 D1 Is Yawning Contagious CYU

9.3 D1 CYU

Check Your Understanding

Mythbusters investigated the question "Is yawning contagious?" Here's a brief recap. Each subject was placed in a booth for an extended period of time and monitored by hidden camera. 34 subjects were given a "yawn seed" by one of the experimenters: that is, the experimenter yawned in the subject's presence before leaving the room. The remaining 16 subjects were given no yawn seed.

Open Ended

STATE the parameter and statistic.

PARA: p1-p2 = __________________

STAT: phat1 - phat2 = _____________

Multiple Choice

STATE

Which is the appropriate set of hypotheses?

• Ho: p1-p2 = 0 yawning is not contagious

  Ha: p1-p2 > 0 yawning is contagious

• Ho: p1-p2 > 0 yawning is contagious

  Ha: p1-p2 = 0 yawning is not contagious

• Ho: p1-p2 = 0 yawning is not contagious

  Ha: p1-p2 < 0 yawning is contagious

Multiple Choice

PLAN

Name the procedure.

• 1 sample z test for proportions

• 2 sample z test

• 2 sample z test for p1-p2

• 2 sample z interval for p1-p2

PLAN - Random and 10% Conditions

• Random - used random assignment. Now we can show causation

• 10% condition - no sampling here so we don't need to check this (experiment)

Multiple Choice

PLAN

Has the Large Counts/Normal condition been met for both samples?

• Yes, it has been met for both samples.

• No, it has not been met for either sample.

• It was only met for sample with the yawn seed (p1) and not for the second sample (p2)

• It was only met for the sample without the yawn seed (p2) and not for the first sample (p1)