Every freshman at Star Wars Academy is issued the same laptop when they start sc

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 False

Explanation / 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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