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Chapter 1: Q 1.35. (page 15)
What is the acronym used for simple random sampling without replacement?
The acronym for simple random sampling without replacement is SRS.
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Regarding simple random sampling:
(a) What is simple random sampling?
(b) What is a simple random sample?
(c) Identify two forms of simple random sampling and explain the difference between the two.
In Exercises 1.7-1.12, classify each of the studies as either descriptive or inferential. Explain your answers.
In-Demand College Majors. In a June 2013 article, published online by The Street, B. O'Connell discussed the results of a survey on opportunities for graduating college students. In one aspect of the survey, the following percentage estimates were reported on which college majors were in demand among U.S. firms. [SOURCE: "The Most In-Demand College Majors This Year." Published by Career-Builder, LLC, 2013.]
Lifetimes of Flashlight Batteries.Two different options are under consideration for comparing the lifetimes of four brands of flashlight battery, using 20 flashlights.
(a) One option is to randomly divide 20 flashlights into four groups of 5 flashlights each and then randomly assign each group to use a different brand of battery. Would this statistical design be a completely randomized design or a randomized block design? Explain your answer.
(b) Another option is to use 20 flashlights - five different brands of 4 flashlights-each and randomly assign the 4 flashlights of each sign be a completely randomized design or a randomized block design? Explain your answer.
The members of a population are numbered 1-5.
(a) List the 10 possible samples (without replacement) of size 3 from this population.
(b) SRS of size 3 is taken from the population, what are the chances of selecting 1, 3, and 5? Explain your answer.
(c) Use Table I in Appendix A to obtain an SRS of size 3 from the population. Start at the single-digit number in line number 5 and column number 20, read down the column, up the next, and so on.
Which of the following sampling procedures involve the use of probability sampling?
a . A college student is hired to interview a sample of voters in her town. She stays on campus and interviews 100 students in the cafeteria.
b . A pollster wants to interview 20 gas station managers in Balti more. He posts a list of all such managers on his wall, closes his eyes, and tosses a dart at the list 20 times. He interviews the people whose names the dart hits
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