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Chapter 1: Q3-3BSC (page 1)
Replication In what specific way was replication applied in the study cited in Exercise 1?
The replication was applied to the experiment by the use of large samples for each of the treatments.
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Statistical Significance versus Practical Significance. When testing a new treatment, what is the difference between statistical significance and practical significance? Can a treatment have statistical significance but not practical significance?
What鈥檚 Wrong with This Picture? The Newport Chronicle ran a survey by asking readers to call in their response to this question: 鈥淒o you support the development of atomic weapons that could kill millions of innocent people?鈥� It was reported that 20 readers responded and that 87% said 鈥渘o,鈥� while 13% said 鈥測es.鈥� Identify four major flaws in this survey.
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d. Among the 1165 respondents, 93 said that a bended knee is corny and outdated. What percentage of respondents said that a bended knee is corny and outdated?
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.
Crime Research A sociologist has created a brief survey to be given to 2000 adults randomly selected from the U.S. population. Here are her first two questions: (1) Have you ever been the victim of a felony crime? (2) Have you ever been convicted of a felony?
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?
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