Question
1.25
Average weights in the United States: The CDC reported very large weight increases for U.S. residents of both genders and all age groups over the past four decades. Go to the Web site that reports these data (http://www.cdc.gov) and search for the article titled “Americans Slightly Taller, Much Heavier Than Four Decades Ago.”
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Question
1.26
Sample versus population in Norway: The Nord-Trøndelag health study surveyed more than 60,000 people in a Norwegian county and reported that gastrointestinal symptoms, depression, and anxiety disorders are strongly related (Haug, Mykletun, & Dahl, 2002).
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Question
1.27
Types of variables and Olympic swimming: At the 2012 London Summer Olympics, American Michael Phelps won four gold medals, bringing his overall Olympic career total to 18 gold medals, the all-time career record for Olympic gold medals in any sport. One of the events he won was the 100-meter butterfly. For each of the following examples, identify the type of variable—nominal, ordinal, or scale.
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Question
1.28
Types of variables and the Kentucky Derby: The Kentucky Derby is perhaps the premier event in U.S. horse racing. For each of the following examples from the derby, identify the type of variable—nominal, ordinal, or scale.
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Question
1.29
Discrete versus continuous variables: For each of the following examples, state whether the scale variable is discrete or continuous.
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Question
1.30
Reliability and validity: Go online and take the personality test found at http://www.outofservice.com/ starwars. This test assesses your personality in terms of the characters from the original Star Wars series. (You may have to scroll down to get to the questions.)
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Question
1.31
Reliability, validity, and wine ratings: You may have been in a wine store and wondered just how useful those posted wine ratings are. (They are usually rated on a scale from 50 to 100, with 100 being the top score.) After all, aren’t ratings subjective? Corsi and Ashenfelter (2001) studied whether wine experts are consistent. Knowing that the weather is the best predictor of price, the researchers wondered how well weather predicted experts’ ratings. The variables used for weather included temperature and rainfall, and the variable used for wine experts’ ratings was the number they assigned to each wine.
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Question
1.32
Operationalizing variables and rap statistics: The Web site Rap Genius analyzes rap music using what they call RapMetrics (http://rapgenius.com/posts/63-Introducing-rapmetricstm-the-birth-of-statistical-analysis-of-rap-lyrics). It has developed a measure called rhyme density, which is the proportion of all syllables that are part of the rhyme. Eminem’s Without Me, for example, has a rhyme density of 0.49 (49%) because almost half of the lyrics are part of the rhyme, whereas Notorious B.I.G.’s Juicy only has a rhyme density of 0.23 (23%). The people behind Rap Genius say, “Over the course of a career, the rappers with the highest rhyme densities are basically the best technical rappers.”
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Question
1.33
Identifying and operationalizing variables: For each of the following hypotheses, identify the independent variable and the most likely levels of that independent variable. Then identify the likely dependent variable and a likely way to operationalize that dependent variable. Be specific.
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Question
1.34
Between-groups versus within-groups and exercise: Noting marked increases in weight across the population, researchers, nutritionists, and physicians have struggled to find ways to stem the tide of obesity in many Western countries. They have advocated a number of exercise programs, and there has been a flurry of research to determine the effectiveness of these programs. Pretend that you are in charge of a research study to examine the effects of an exercise program on weight loss in comparison with a program that does not involve exercise.
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Question
1.35
Correlational research and smoking: For decades, researchers, politicians, and tobacco company executives debated the relation between smoking and health problems such as cancer.
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Question
1.36
Experimental versus correlational research and culture: A researcher interested in the cultural values of individualistic and collectivist societies collects data on the rate of relationship conflict experienced by 32 people who test high for individualism and 37 people who test high for collectivism.
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Question
1.37
Experimental versus correlational research and recycling: A researcher wants to know if people’s concerns about the environment vary as a function of incentives provided for recycling. Students living on a university campus are recruited to participate in a study. Some students are randomly assigned to a group in which they are rewarded financially for their recycling efforts for one month. The other students are randomly assigned to a group in which they are assessed a fine that is based on the amount of material that they could have, but did not, recycle.
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Question
1.38
Outliers, exercise, and weight gain: Imagine that you conducted the study described in Exercise 1.34 and that one person had gained many, many pounds while in the exercise program.
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Question
1.39
Outliers and response time: Imagine that a researcher is measuring the time it takes participants to identify whether a string of letters constitutes a word (e.g., duke) or a nonword (e.g., dake). She measures the response time of 40 participants. She finds that most participants took from ½ to 1 second to make their decision but that one participant took 3 minutes to make a decision.
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