Every freshman at Star Wars Academy is issued the same laptop when they start sc
ID: 3252256 • 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. (a) 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 (b) 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 (c) True or False. Using a simple random sample is the most appropriate sampling method for obtaining 100 laptop batteries. True FalseExplanation / Answer
SolutionA:
average lifetime of laptop batteries for star wars students
which is population
and average is population mean
ANSWERA:
ALL LAPTOP BATTERIES OF STAR WARS ACADEMY STUDENTS
Solutionb:
paramter is sample mean
smaaple size=n=100
battery lifetime for each is recorded
ANSWERC:
THE AVERAGE LIFTIME OF THE LAPTOP BATTERIES BELONGING TO STAR WARS ACADMY STUDENTS
Solutionc:
TRUE
look for are randomly sampled
SRS SIMPLE RANDOM SAMPLING
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