Chapter 1: Q 1.3. (page 7)
Identify some methods used in descriptive statistics.
Construction of charts, graphs, and tables, calculation of averages, the measure of variation and percentile, etc are some of the methods used in descriptive statistics.
Over 30 million students worldwide already upgrade their learning with Vaia!
All the tools & learning materials you need for study success - in one app.
Get started for free
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
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.
Vasectomies and Prostate Cancer. Refer to the vasectomy/ prostate cancer study discussed in Example 1.5 on page 6.
(a). How could the study be modified to make it a designed experiment?
(b). Comment on the feasibility of the designed experiment that you described in part (a).
Thoughts on Evolution. In an article titled "Who has designs on your student's minds?" (Nature, Vol. 434, pp. 1062-1065), author G. Brumfiel postulated that support for Darwinism increases with level of education. The following table provides percentages of U.S. adults, by educational level, who believe that evolution is a scientific theory well supported by evidence.
(a) Do you think that this study is descriptive or inferential? Explain your answer.
(b) If, in fact, the study is inferential, identify the sample and population.
AVONEX and MS. An issue of Inside MS contained an article describing AVONEX (interferon beta-la), a drug used in the treatment of relapsing forms of multiple sclerosis (MS). Included in the article was a report on "... adverse events and selected laboratory abnormalities that occurred at an incidence of 2% or more among the 158 multiple sclerosis patients treated with 30 mcg of AVONEX once weekly by IM injection." In the study, 158 patients took AVONEX and 143 patients were given placebo.
(a) Is this study observational or is it a designed experiment?
(b) Identify the treatment group, control group, and treatments.
What do you think about this solution?
We value your feedback to improve our textbook solutions.
