Chapter 01.4 Exercise Question 24

1.4.24

Can domestic dogs understand human body cues such as bowing, pointing, or glancing? The experimenter presented a body cue toward one of two objects and recorded whether or not the dog being tested correctly chose the object indicated. A four-year-old male pit bull named Krieger participated in this study. He chose the correct object 6 out of 10 times when the experimenter turned and looked towards the correct object. Instead of looking at the object, the experimenter kept her eyes on the dog and leaned toward the object. For this part of the study, Krieger got 9 right out of 10.

Part 1

Use the One Proportion applet to develop a null distribution for this scenario. Based on the study's result and your null distribution, calculate a standardized statistic.(Round answer to 1 decimal place, e.g. 5.2)

the absolute tolerance is +/-0.2

Part 2

Strength of evidence: Thep-value for this test is 0.01. What are your conclusions based on thisp-value? Are the conclusions the same if you base them off the standardized-statistic found above in part (a)?

A. Using both thep-value and the standardized statistic, we have weak evidence that the long-run proportion of times that Krieger makes the correct choice is more than 50%.

B. Using both thep-value and the standardized statistic, we have strong evidence that the long-run proportion of times that Krieger makes the wrong choice is more than 60%.

C. Using both thep-value and the standardized statistic, we have strong evidence that the long-run proportion of times that Krieger makes the correct choice is more than 50%.

D. Using both thep-value and the standardized statistic, we have strong evidence that the long-run proportion of times that Krieger makes the correct choice is less than 30%.