Chapter 1: Q 1.82. (page 29)
State and explain the significance of the three basic principles of experimental design.
Control, Randomization, and Replication are the three basic principles of experimental design.
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Oklahoma State Officials. Refer to Table 5.1 on page 196.
(a). List the possible samples without replacement of size 4 that can be obtained from the population of five officials. (Hint: There are five possible samples.)
If a simple random sample without replacement of four officials is taken from the five officials, determine the probability that
(b). the governor, secretary of state, attorney general, and treasurer are obtained.
(c). the governor and treasurer are included in the sample.
(d). the governor is included in the sample.
Explain two ways in which descriptive statistics and inferential statistics are interrelated.
What is the acronym used for simple random sampling without replacement?
In a designed experiment, there are two factors, say, Factor Aand Factor B. Factor Ahas four levels, say, ; Factor B has two levels, say,.
(a) Construct a schematic for the treatments similar to Table 1.8 on page 27.
(b) Use part ( a ) to determine the number of treatments.
(c) Could you have determined the answer for part ( b ) without constructing the schematic in part ( a )? Explain your answer.
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.
Sex, Sleep, and PTSD. In the article, "One's Sex, Sleep, and Posttraumatic Stress Disorder" (Biology of Sex Differences, Vol. 3, No. 29, pp. 1-7), I. Kobayashi et al. study the relationship between one's sex, sleep patterns, and posttraumatic stress disorder (PTSD) after trauma exposure. The authors report that women have a higher lifetime prevalence of PTSD as well as a greater risk of developing PTSD following trauma exposure. Relationships between sleep and physical health have been documented in a number of studies, and the authors explore the possibility that disruptive sleep habits are common among people with PTSD and also a possible risk factor for the development of PTSD. A questionnaire of men and women with and without PTSD produced data on their sleep habits.
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