Krieger*

Can domestic dogs understand human body cues such as bowing, pointing, or glancing? e experimenter presen- ted 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.

1.4.18

a. Identify the parameter of interest for this study and as- sign a symbol to it.

b. If Krieger is just randomly choosing between the two ob- jects, what is the chance that he will choose the correct object?

c. State your null hypothesis and an appropriate one-sided alternative hypothesis.

1.4.19

a. Statistic: How many times did Krieger choose the cor- rect object? Out of how many attempts? us, what proportion of the time did Krieger choose the correct object?

b. Simulate: Using an applet, simulate 1,000 repetitions of having the dog choose between the two objects if he is doing so randomly. Report the mean and standard deviation.

c. Based on the study's result, what is the p-value for this test?

d. Strength of evidence: What are your conclusions based on the p-value?

e. How would the evidence change if Krieger got 8 out of

10 correct?