Every freshman at Star Wars Academy is issued the same laptop when they start sc
ID: 3043545 • Letter: E
Question
Every freshman at Star Wars Academy is issued the same laptop when they start school. Since laptops are continually evolving, the following year’s freshmen are all issued the same, but newer, laptops than the previous year’s class. Each class from freshman to senior year has the same computer, but the computers vary across class year.
Students are allowed to keep their laptops after they graduate. Unfortunately, some of the laptop batteries fail before graduation. Consider a study to estimate the average lifetime of laptop batteries for Star Wars students. One hundred laptops are randomly sampled and the battery lifetime for each is recorded.
What is the population of interest?
A. All laptop batteries of Star Wars Academy students
B. Laptop batteries for the sample of 100 students
C. The laptop battery of a single student
D. All laptop batteries of this type sold worldwide
What is the parameter of interest?
A. The lifetime of a laptop battery for a given student
B. The number of laptop batteries belonging to Star Wars Academy students that fail within four years
C. The average lifetime of the laptop batteries belonging to the sample of 100 students
D. The average lifetime of all laptop batteries belonging to Star Wars Academy students
Why is NOT using a simple random sample the most appropriate sampling method for obtaining 100 laptop batteries?
A simple random sample of 500 college students is selected from all students registered at ABC College, and of these 500 students, 100 of them participate in the annual on-campus Spelling Bee.
True or False. The proportion of students at ABC College who participate in the Spelling Bee is 20%.
True or False. The proportion of students at ABC College who participate in the Spelling Bee is likely to be close to 20%, but not equal to 20%.
Explanation / Answer
What is the population of interest?
Answer: A. All laptop batteries of Star Wars Academy students
[Population of interest is related to the star Wars Academy and reference frame for the study is considered as the laptop batteries of Star War Academy students.]
What is the parameter of interest?
Answer: D. The average lifetime of all laptop batteries belonging to Star Wars Academy students
[Parameter is always related to the population and that’s why the parameter of interest for this scenario is nothing but the average lifetime of batteries belonging to Star Wars Academy students.]
True or False. The proportion of students at ABC College who participate in the Spelling Bee is 20%.
Answer: False
[Proportion 20% is only related to sample and not entire population of students at ABC college.]
True or False. The proportion of students at ABC College who participate in the Spelling Bee is likely to be close to 20%, but not equal to 20%.
Answer: False
[True population proportion would be close to 20% or it may be 20%.]
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