The paper “Effects of Age and Gender on Physical Performance” (Age : 77–85) describes a study of the relationship between age and 1-hour swimming performance. Data on age and swim distance for over 10,000 men participating in a national long-distance 1-hour swimming competition are summarized in the accompanying table. In Exercise 5.34 from Section 5.3, a plot of the residuals from the least-squares line showed a curved pattern that suggested that a quadratic curve would do a better job of summarizing the relationship between x = representative age and y = average swim distance. Find the equation of the least-squares quadratic curve and use it to predict average swim distance at 40 years of age. y^ = 3843.027 + 10.619x - 0.360x2 y^ = 3691.293
Answer to relevant QuestionsThe accompanying data are x = cost (cents per serving) and y = fiber content (grams per serving) for 18 high-fiber cereals rated by Consumer Reports (www .consumerreports.org/health). a. Compute and interpret the ...Penicillin was administered orally to five different horses, and the concentration of penicillin in the blood was determined after five different lengths of time. The following data on x = elapsed time (in hours) and y = ...As part of a study of the effects of timber management strategies (Ecological Applications : 1110– 1123) investigators used satellite imagery to study abundance of the lichen Lobaria oregano at different elevations. ...The paper “A Cross-National Relationship Between Sugar Consumption and Major Depression?” (Depression and Anxiety : 118–120) concluded that there was a correlation between re fined sugar consumption (calories per ...No tortilla chip lover likes soggy chips, so it is important to find characteristics of the production process that produce chips with an appealing texture. The accompanying data on x = frying time (in seconds) and y = ...
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