Bundle: Statistics for the Behavioral Sciences, Loose-leaf Version, 10th + Aplia, 1 term Printed Access Card
10th Edition
ISBN: 9781337129039
Author: Frederick J Gravetter, Larry B. Wallnau
Publisher: Cengage Learning
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Chapter 9, Problem 20P
An example of the vertical-horizontal illusion is shown in the figure. Although the two lines are exactly the same length, the vertical line appears to be much longer. To examine the strength of this illusion, a researcher prepared an example in which both lines were exactly 10 inches long. The example was shown to individual participants who were told that the horizontal line was 10 inches long and then were asked to estimate the length of the vertical line. For a sample of
a. Use a one-tailed hypothesis test with
b. Calculate the estimated d and
c. Construct a 95% confidence interval for the population mean estimated length of the vertical line.
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Here we have data that represent the results of a study comparing different viewing distances for a 42 inch high definition television. Four viewing distances were evaluated, 9 feet, 12 feet, 15 feet and 18 feet. Each participant watched a 30 minute television program from one of the distances and then rated the viewing distance on a scale from 1 (Very Bad, definitely need to move closer or father away) to 7 (excellent, perfect viewing distance). The following day, the participants returned and watched another program from a different distance. This process continued until all five participants had experienced and rated all four distances.
Viewing Distance
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B
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A common measure of flexibility is the sit-and-reach test, where a person sits on the floor with legs straight in front.
The person then reaches as far forward as possible, and the distance reached past the feet is recorded. The
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Middle-Aged Men
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20-
15-
Frequency
10+
5
-20
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(A)
(B)
(C)
(D)
Which of the following statements is the best description of the distributions of distances?
The distribution for young adult men is approximately symmetric, and the distribution for middle-aged men
is skewed to the right.
The distribution for young adult men is approximately symmetric, and the distribution for middle-aged men
is skewed to the left.
The distribution for young adult men is skewed to…
A group of 1,000 people was randomly chosen as a sample for a survey.
The ages of the people were analyzed.
• The range of the ages was 25 years.
• More than half of the people were 45 years old or younger.
• The lowest 25% of the ages hada range of 5 years.
Which box plot could represent the ages of the people in the sample?
++++
20 25 30 35 40 45 50 55 60 65 70
H OH
20 25 30 35 40 45 50 55 60 65 70
十十十+
20 25 30 35 40 45 50 55 60 65 70
+++ ++++ ++++
OH
20 25 30 35 40 45 50 55 60 65 70
+++++++++ HIT+
An expression is choun
Chapter 9 Solutions
Bundle: Statistics for the Behavioral Sciences, Loose-leaf Version, 10th + Aplia, 1 term Printed Access Card
Ch. 9 - Under what circumstances is a t statistic used...Ch. 9 - A sample of n=16 scores has a mean of M=56and a...Ch. 9 - Find the estimated standard error for the sample...Ch. 9 - Explain why tdistributions tend to be flatter and...Ch. 9 - Find the t values that form the boundaries of the...Ch. 9 - Find the t value that forms the boundary of the...Ch. 9 - The following sample of n=4 scores was obtained...Ch. 9 - The following sample was obtained from a...Ch. 9 - A random sample of n=12 individuals is selected...Ch. 9 - A random sample of n=25 individuals is selected...
Ch. 9 - To evaluate the effect of a treatment, a sample is...Ch. 9 - To evaluate the effect of a treatment, a sample of...Ch. 9 - The spotlight effect refers to overestimating the...Ch. 9 - ]14. Many animals, including humans, tend to avoid...Ch. 9 - Standardized measures seem to indicate that the...Ch. 9 - Weinstein, McDermott, and Roediger (2010) report...Ch. 9 - Ackerman and Goldsmith (2011) found that students...Ch. 9 - A random sample of n=16 scores is obtained from a...Ch. 9 - A random sample is obtained from a population with...Ch. 9 - An example of the vertical-horizontal illusion is...Ch. 9 - In the Preview for this Chapter, we discussed a...Ch. 9 - Oishi and Schimmk (2010) report that people who...Ch. 9 - Research examining the effects of preschool...
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