Exercises 5–8 refer to the study of an association between which ear is used for cell phone calls and whether the subject is left-handed or right-handed. The study is reported in “Hemispheric Dominance and Cell Phone Use,” by Seidman et al., JAMA Otolaryngology—Head & Neck Surgery, Vol. 139, No. 5. The study began with a survey e-mailed to 5000people belonging to an otology online group, and 717 surveys were returned. (Otology relates to the ear and hearing .) 5. Sampling Method What type of sampling best describes the way in which the 717 subjects were chosen: simple random sample, systematic sample, convenience sample, stratified sample, cluster sample? Does the method of sampling appear to adversely affect the quality of the results?
Exercises 5–8 refer to the study of an association between which ear is used for cell phone calls and whether the subject is left-handed or right-handed. The study is reported in “Hemispheric Dominance and Cell Phone Use,” by Seidman et al., JAMA Otolaryngology—Head & Neck Surgery, Vol. 139, No. 5. The study began with a survey e-mailed to 5000people belonging to an otology online group, and 717 surveys were returned. (Otology relates to the ear and hearing .) 5. Sampling Method What type of sampling best describes the way in which the 717 subjects were chosen: simple random sample, systematic sample, convenience sample, stratified sample, cluster sample? Does the method of sampling appear to adversely affect the quality of the results?
Solution Summary: The author explains that the sampling method used is convenience sampling, which appears to adversely affect the quality of the results.
Exercises 5–8 refer to the study of an association between which ear is used for cell phone calls and whether the subject is left-handed or right-handed. The study is reported in “Hemispheric Dominance and Cell Phone Use,” by Seidman et al., JAMA Otolaryngology—Head & Neck Surgery, Vol. 139, No. 5. The study began with a survey e-mailed to 5000people belonging to an otology online group, and 717 surveys were returned. (Otology relates to the ear and hearing.)
5. Sampling Method What type of sampling best describes the way in which the 717 subjects were chosen: simple random sample, systematic sample, convenience sample, stratified sample, cluster sample? Does the method of sampling appear to adversely affect the quality of the results?
The paper "Deception and Design: The Impact of Communication Technology on Lying Behavior"+ describes an investigation into whether lying is less common in face-to-face communication than in other forms of
communication such as phone conversations or e-mail. Participants in this study were 30 students in an upper-division communications course at Cornell University who received course credit for participation. Participants
were asked to record all of their social interactions for a week, making note of any lies told.
Based on data from these records, the authors of the paper concluded that students lie more often in phone conversations than in face-to-face conversations and more often in face-to-face conversations than in e-mail.
Discuss the limitations of this study, commenting on the way the sample was selected and potential sources of bias. (Select all that apply.)
O Students knew that they were surveying themselves as to the truthfulness of their interactions, which could have…
The characteristics of check teeth (e.g., molars) can provide anthropologists with information on the dietary habits of extinct mammals. The check teeth of an extinct primate species was the subject of research reported in the American Journal of Physical Anthropology (Vol. 142, 2010). A total of 18 check teeth extracted from skulls discovered in western Wyoming were analyzed. Each tooth was classified according to degree of wear (unworn, slight, light-moderate, moderate, moderate-heavy, or heavy). The 18 measurements are listed here.
Data on Degree of Wear
Unknown
Slight
Unknown
Slight
Unknown
Heavy
Moderate
Unknown
Slight
Light-moderate
Unknown
Light-moderate
Moderate-heavy
Moderate
Moderate
Unworn
Slight
Unknown
Identify the variable measured in the study and its type (qualitative and quantitative)
Form frequency distribution.
Identify the degree of wear category that occurred most often in the sample of 18 check teeth.
A paper described a survey of 507 undergraduate students at a state university in the southwestern region of the United States. Each student in the sample was classified according to class standing (freshman, sophomore, junior, or senior) and body art category (body piercings
only, tattoos only, both tattoos and body piercings, no body art).
Use the data in the accompanying table to determine if there is evidence of an association between class standing and response to the body art question. Assume that it is reasonable to regard the sample of students as representative of the students at this university. Use
α = 0.01.
Freshman
Sophomore
Junior
Senior
Body
Piercings
Only
64
44
20
21
Tattoos
Only
7
11
9
17
Both Body
Piercings and
Tattoos
17
10
7
26
Calculate the test statistic. (Round your answer to two decimal places.)
x² = |
No
Body
Art
86
65
46
57
Use technology to calculate the P-value. (Round your answer to four decimal places.)
P-value =
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