Introduction to Statistics and Data Analysis
5th Edition
ISBN: 9781305445963
Author: PECK
Publisher: Cengage
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Textbook Question
Chapter 2, Problem 77CR
You have been asked to determine on what types of grasslands two species of birds, northern harriers and short-eared owls, build nests. The types of grasslands to be used include undisturbed native grasses, managed native grasses, undisturbed nonnative grasses, and managed nonnative grasses. (Based on the article “Response of Northern Harriers and Short-Eared Owls to Grassland Management in Illinois,” Journal of Wildlife Management [1999]: 517-523.)
- a. You are allowed a plot of land 500 meters square to study. Explain how you would determine where to plant the four types of grasses. What role would random assignment play in this determination?
- b. Identify any confounding variables.
- c. Would this study be considered an observational study or an experiment?
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What is the 95% confidence interval of the difference of means,
? Round your answers to two decimal
places.
4) Many animals, including humans, tend to avoid direct eye contact and even patterns that look like eyes. Some insects, including moths, have evolved eye-spot patterns on their wings to help ward off predators. Scaife (1976) reports a study examining how eye-spot patterns affect the behavior of birds. In the study, the birds were tested in a box with two chambers and were free to move from one chamber to another. In one chamber, two large eye-spots were painted on one wall. The other chamber had plain walls. The researcher recorded the amount of time each bird spent in the plain chamber during a 60-minute session. Suppose the study produced a mean of M = 34.5 minutes in the plain chamber with SS = 210 for a sample of n = 15 birds. (Note: If the eye-spots have no effect, then the birds should spend an average of µ = 30 minutes in each chamber.)
a) Is this sample sufficient to conclude that the eye-spots have a significant influence on the birds’ behavior? Use a two-tailed test with α =…
A researcher is interested in examining whether the location that a person lives is related to the number of hours that they spend on the internet each week. The researcher collected data from a sample of 30 participants who were classified in one of three groups: (1) 10 people who live in an urban setting, (2) 10 people who live in a suburban setting, and (3) 10 people who live in a rural setting. Each participant reported the number of hours they spend on the internet in a typical week (the dependent variable). The researcher found the following descriptive statistics:
Urban participants reported an average of 8.9 hours of internet use per week with a standard deviation of 2.77.
Suburban participants reported an average of 12.7 hours of internet use per week with a standard deviation of 4.88.
Rural participants reported an average of 9.8 hours of internet use per week with a standard deviation of 2.82.
Using the data that was collected, the researcher found the following:
The…
Chapter 2 Solutions
Introduction to Statistics and Data Analysis
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