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Chapter 1: Q6 (page 9)
Determine whether the given source has the potential to create bias in a statistical study.
Arsenic in Rice. Amounts of arsenic in samples of rice grown in Texas were measured by the Food and Drug Administration (FDA).
No, there is no potential for bias in the study.
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Sampling In a statistical study, which of the following types of samples is generally best: convenience sample, voluntary response sample, simple random sample, biased sample?
In Exercises 21鈥�28, determine whether the study is an experiment or an observational study, and then identify a major problem with the study.
Online News In a survey conducted by USA Today, 1465 Internet users chose to respond to this question posted on the USA Today electronic edition: 鈥淚s news online as satisfying as print and TV news?鈥� 52% of the respondents said 鈥測es.鈥�
Determine whether the data are from discrete data or continuous data set.
House AttendanceThe Clerk of the U.S. House of Representatives records the number of representatives present at each session.
In Exercises 29鈥�36, answer the given questions, which are related to percentages.
Marriage Proposals In a survey conducted by TheKnot.com, 1165 engaged or married women were asked about the importance of a bended knee when making a marriage proposal. Among the 1165 respondents, 48% said that the bended knee was essential.
a. What is the exact value that is 48% of 1165 survey respondents?
b. Could the result from part (a) be the actual number of survey subjects who said that a bended knee is essential? Why or why not?
c. What is the actual number of survey respondents saying that the bended knee is essential?
d. Among the 1165 respondents, 93 said that a bended knee is corny and outdated. What percentage of respondents said that a bended knee is corny and outdated?
Exercises 5鈥�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 鈥淗emispheric Dominance and Cell Phone Use,鈥� by Seidman et al., JAMA Otolaryngology鈥� Head & Neck Surgery, Vol. 139, No. 5. The study began with a survey e-mailed to 5000 people belonging to an otology online group, and 717 surveys were returned. (Otology relates to the ear and hearing.)
Experiment or Observational Study Is the study an experiment or an observational study? Explain
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