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Chapter 1: Q2-10BSC (page 1)
Identify whether the given value is a statistic or a parameter.
Birth Genders In the same study cited in the preceding exercise, 51% of the babies were girls.
The percentage of female babies out of 400 babies born is equal to 51% and represents a statistic.
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For Chapter 2 through Chapter 14, the Cumulative Review Exercises include topics from preceding chapters. For this chapter, we present a few calculator warm-up exercises, with expressions similar to those found throughout this book. Use your calculator to find the indicated values.
Determining Sample Size The given expression is used to determine the size of the sample necessary to estimate the proportion of college students who have the profound wisdom to take a statistics course. Find the value and round the result to the nearest whole number.
\(\frac{{{{1.96}^2} \times 0.25}}{{{{0.03}^2}}}\)
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.
Physicians鈥� Health Study The Physicians鈥� Health Study involved 22,071 male physicians. Based on random selections, 11,037 of them were treated with aspirin and the other 11,034 were given placebos. The study was stopped early because it became clear that aspirin reduced the risk of myocardial infarctions by a substantial amount.
Statistical Significance and Practical Significance. In Exercises 13鈥�16, determine whether the results appear to have statistical significance, and also determine whether the results appear to have practical significance.
MCAT The Medical College Admissions Test (MCAT) is commonly used as part of the decision-making process for determining which students to accept into medical schools. To test the effectiveness of the Siena MCAT preparation course, 16 students take the MCAT test, then they complete the preparatory course, and then they retake the MCAT test, with the result that the average (mean) score for this group rises from 25 to 30. There is a 0.3% chance of getting those results by chance. Does the course appear to be effective?
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).
In Exercises 9鈥�12, determine whether the sampling method appears to be sound or is flawed.
Smartphone Usage In a survey of smartphone ownership, the Pew Research Center randomly selected 1006 adults in the United States.
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