Answer to Question 1
A. The number of hours of sleep a teenager gets per night.
FEEDBACK:
The population mean () is an expression of an average number, such as the number of kids per family, the average weight or height of a woman, or the number of hours per sleep a teenager gets per night. All of the estimated statistics presented in the video were percentages--that is, estimates of a population proportion, or p, expressed as a percentage. A risk is another word for a probability which is estimated using a proportion. That is, if your risk of having a heart attack is 1 in 5 (or .2), that is usually estimated by collecting a sample of people from a particular population and counting how many people in that sample who had a heart attack and dividing by the number of people in the sample. That estimated population proportion is also used as an estimate of the probability (i.e., risk) someone from that population will have a heart attack in the future. In other words, the words proportion, probability, percentage and risk are all essentially referring to different flavors of estimates of the same parameter, p.
Answer to Question 2
B. The percentage of men who walk a dog on a daily basis.
FEEDBACK:
The video has three separate focusses: the percentage of high-schoolers who report they use sunscreen, the risk of obesity among children who don't get enough sleep, and the risk of heart attack for men over 50 who have close community ties. The video shows a man walking a dog, but doesn't discuss the percentage of men who walk a dog on a daily basis.
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