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Chapter 1: Q 1.86. (page 29)
In a designed experiment, there is one factor with five levels. How many treatments are there?
Five treatments are there.
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The inferential procedures discussed in this book are intended for use with only one particular sampling procedure. What sampling procedure is that?
On-Time Airlines. From the FlightStats On-time Performance Report Summary, we found that, in July 2013, the top five North American airlines in terms of percentage of on-time arrivals were Hawaiian (H), Horizon (Z), Compass (C), Alaska (A), and Jazz (J).
(a) List the 10 possible samples ( without replacement ) of size 3 that can be obtained from the population of five airlines. Use the parenthetical abbreviations in your list.
(b) If a simple random sampling procedure is used to obtain a sample of three of these five airlines, what are the chances that it is the first sample on your list in part (a) ? the second sample? the tenth sample?
(c) Describe three methods for obtaining a simple random sample of three of these five airlines.
(d) Use one of the methods that you described in part (c) to obtain a simple random sample of three of these five airlines.
In Exercises 1.7-1.12, classify each of the studies as either descriptive or inferential. Explain your answers.
Drug Use. The U.S. Substance Abuse and Mental Health Services Administration collects and publishes data on nonmedical drug use, by type of drug and age group, in National Survey on Drug Use and Health. The following table provides data for the years 2003 and 2008. The percentages shown are estimates for the entire nation based on information obtained from a sample (NA, not available).
Sampling Dorm Residents. Students in the dormitories of a university in the state of New York live in clusters of four double rooms, called suites. There are 48 suites, with eight students per suite.
(a) Describe a cluster sampling procedure for obtaining a sample of 24 dormitory residents.
(b) Students typically choose friends from their classes as suitemates. With that in mind, do you think cluster sampling is a good procedure for obtaining a representative sample of dormitory residents? Explain your answer.
(c) The university housing office has separate lists of dormitory residents by class level. The number of dormitory residents in each class level is as follows. Use the table to design a procedure for obtaining a stratified sample ( with proportional allocation ) of 24 dormitory residents.
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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