Introduction To Statistics And Data Analysis
6th Edition
ISBN: 9781337793612
Author: PECK, Roxy.
Publisher: Cengage Learning,
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Textbook Question
Chapter 2.3, Problem 47E
The paper “Turning to Learn: Screen Orientation and Reasoning from Small Devices” (Computers in Human Behavior [2011]: 793–797) describes a study that investigated whether cell phones with small screens are useful for gathering information. The researchers wondered if the ability to reason using information read on a small screen was affected by the screen orientation. The researchers assigned 33 undergraduate students who were enrolled in a psychology course at a large public university to one of two groups at random.
One group read material that was displayed on a small screen in portrait orientation, and the other group read material on the same size screen but turned to display the information in landscape orientation (see figure below).
The researchers found that performance on a reasoning test that was based on the displayed material was better for the group that read material in the landscape orientation.
- a. Is the described study an observational study or an experiment?
- b. Did the study use random selection from some population?
- c. Did the study use random assignment to experimental groups?
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PEER REPLY 1:
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Is this average hourly wage considered representative?
The following is a list of questions answered correctly on an exam. Calculate the
Measures of Central Tendency from the ungrouped data list.
NUMBER OF QUESTIONS ANSWERED CORRECTLY ON AN APTITUDE EXAM
112
72
69
97
107
73
92
76
86
73
126
128
118
127
124
82
104
132
134
83
92
108
96
100
92
115
76
91
102
81
95
141
81
80
106
84
119
113
98
75
68
98
115
106
95
100
85
94
106
119
Chapter 2 Solutions
Introduction To Statistics And Data Analysis
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