1. A study found that parenting classes were closely related to a child\'s perfo
ID: 3330931 • Letter: 1
Question
1. A study found that parenting classes were closely related to a child's performance in school. Each week of parenting classes taken by a child's parents raised their high school GPA by 0.23 points. With an intercept of 1.68, what could parents who attended 8 weeks of classes expect to see in their child's subsequent GPA? o A. 2.52 o B. 3.21 o C. 3.52 o D. 3.79 2. A research project found that in studying the effects of days spent in drug rehabilitation and number of subsequent arrests, that the slope was -0.59 and the intercept was 6.13. If a person spends 3 days in rehabilitation, what would be their predicted number of future arrests? A. 2.37 . B. 4.36 - C. 6.32 D. 7.90 3. A researcher asked a sample of dual career families about the percentage of the family budget contributed by the wife's job (Y) and the total number of children (). Pearson's r for this relationship is -0.34. Which of the following is an appropriate interpretation of these results? - A. For every dollar contributed by the wife, the number of children increases by .34 . B. For every additional child, the wife must work longer hours. - C. Every additional child lowers the economic wellbeing of the family. D. As number of children increase, the percentage of the budget contributed by the wife decreases. 4. A study of traffic safety shows a correlation of 0.57 between average speed of traffic and number of fatal accidents for a particular stretch of highway. This means that - A. drivers should speed up to get through this area as quickly as possible. B. as speed increases, fatalities decrease. C. fatalities tend to increase D. every 1 mile per hour increase in average speed increases the number of traffic fatalities by .57 as average speed increases. 5. In a study of the relationship between geographical mobility (number of times a person has changed residences) and number of friends, Pearson's coefficient of determination (is reported as .40. Which of the following would be a correct interpretation? . A. Mobility explains 16% of the variation in number of friends. B. There is a strong positive relationship between number of friends and mobility - C. As mobility increases, number of friends decreases. . D. Mobility explains 40% of the variation in number of friends.Explanation / Answer
1. For x = 1.68,
y = 0.23*8 + 1.68 = 3.52
Option C is correct.
2. y = -0.59(3) + 6.13 = 4.36
Option B is correct.
3. Option D is correct.
4. Option C is correct.
5. Option D is correct.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.