Chapter 1: Q 1.34. (page 15)
Identify two methods for obtaining a simple random sample.
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In each of Exercises 1.55-1.58, fill in the blank (s).
Systematic random sampling is easier to execute than simple random sampling and usually provides comparable results. The exception is the presence of some kind of in the listing of the members of the population.
In Exercises 1.17-1.22, state whether the investigation in question is an observational study or a designed experiment. Justify your answer in each case.
Starting Salaries. The National Association of Colleges and Employers (NACE) compiles information on salary offers to new college graduates and publishes the results in Salary Survey.
Do you think that these rates are descriptive statistics or inferential statistics? Explain your answer.
Peanut Allergies. In the article " Food Allergy Advice May Be Peanuts " (Science News, Vol . 174, No. 12, pp . 8-9), N. Seppa reports that early exposure to peanuts seems to lessen the risk of nut allergy. Of 4000 Jewish children sampled in Britain, 1.85 % had peanut allergies; and of 4600 Jewish children sampled in Israel, where early peanut consumption is more common, 0.17 % had peanut allergies. The researcher chose Jewish children in both countries to limit genetic differences between groups.
(a) Is this study descriptive or inferential?
(b) Is this study observational or experimental?
In sampling from a population, state which type of sampling design corresponds to each of the following experimental designs:
(a) Completely randomized design
(b) Randomized block design
Baseball Scores. From ESPN MLB Scoreboard, we obtained the following major league baseball scores for August 14, 2013. Is this study descriptive or inferential? Explain your answer.
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