Answered: What design? Analyze the design of each…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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What design? Analyze the design of each research
example reported. Is it a sample survey, an observational

study, or an experiment? If a sample, what are the popula-
tion, the parameter of interest, and the sampling procedure?

If an observational study, was it retrospective or prospective?

If an experiment, describe the factors, treatments, randomi-
zation, response variable, and any blocking, matching, or

blinding that may be present. In each, what kind of conclu-
sions can be reached?Researchers at the Purina Pet Institute studied Labrador
retrievers for evidence of a relationship between diet
and longevity. At 8 weeks of age, 2 puppies of the same
sex and weight were randomly assigned to one of two
groups—a total of 48 dogs in all. One group was allowed
to eat all they wanted, while the other group was fed a
diet about 25% lower in calories. The median life span
of dogs fed the restricted diet was 22 months longer than
that of other dogs. (Source: Science News 161, no. 19)

Definition Definition Middle value of a data set. The median divides a data set into two halves, and it also called the 50th percentile. The median is much less affected by outliers and skewed data than the mean. If the number of elements in a dataset is odd, then the middlemost element of the data arranged in ascending or descending order is the median. If the number of elements in the dataset is even, the average of the two central elements of the arranged data is the median of the set. For example, if a dataset has five items—12, 13, 21, 27, 31—the median is the third item in ascending order, or 21. If a dataset has six items—12, 13, 21, 27, 31, 33—the median is the average of the third (21) and fourth (27) items. It is calculated as follows: (21 + 27) / 2 = 24.

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