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Aresearcher measures how positive a person's mood is and how creative he or she is. The...
2. (11 pts.) Do creative people make better teachers? Ten teachers at a large university were...
2. (11 pts.) Do creative people make better teachers? Ten
teachers at a large university were given a creativity test (scores
range from 0 to 20, with higher scores indicating greater
creativity) and were evaluated regarding teaching performance by
students and peers (a score of 100 indicates an average
performance, and larger scores indicate better performance). The
creativity scores and teaching performance scores are given
below.
Creativity score
Performance score
9
93
7
89
8
95
13
101
10
102...
1. Researchers are studying the effect of alcohol consumption on a person's short-term memory. Six volunteer...
1. Researchers are studying the effect of alcohol consumption on a person's short-term memory. Six volunteer subjects are assigned to consume a certain number of drinks X. A short time later, the subjects are given a memory test, and their score Y on the test is recorded. The data are shown below, together with the means and standard deviations: Subject 1 2 3 4 5 6 mean std dev No. of Drinks 4 2 8 3 1 6 4 2.61...
the army gives a battery of exams to all new recruits. one exam measures a person's...
the army gives a battery of exams to all new recruits. one exam measures a person's ability to work with technical machinery. this exam was given to a random sample of 360 new recruits. in the table below x-scores on the test and f is the frequency of new recruits with score x. x 1 2 3 4 5 6 7 8 9 10 f 28 42 79 83 51 36 18 ...
The well-known psychologist Dr. Elbod has established what he calls his Generalized Anxiety Scale (GAS). The...
The well-known psychologist Dr. Elbod has established what he calls his Generalized Anxiety Scale (GAS). The GAS, which is a scale from 0 to 10, measures the "general anxiety" of an individual, with higher GAS scores corresponding to more anxiety. (Dr. Elbod's assessment of anxiety is based on a variety of measurements, both physiological and psychological.) we're interested in making predictions about individuals' sleep behavior based on their GAS scores. The bivarlate data below give the GAS score (denoted by...
A health researcher does a study investigating the effect of exercise on stress levels in college...
A health researcher does a study investigating the effect of exercise on stress levels in college students. Thery measure how much time a person spends exercising each day (in minutes), and the person's stress level. Below are the means, standard deviations, and correlations Time spent exercising per day Stress level x average: 35 average: 5 SD: 5 SD: 1, r -0.45 The researcher wants to use exercise time to predict stress levels (a) Time spent exercising is the.. x-variable y-variable...
Number of Absences Number of Absences Exam Scores vs. Absences Exam Scores vs. Absences Final Exam...
Number of Absences Number of Absences Exam Scores vs. Absences Exam Scores vs. Absences Final Exam Score Final Exam Score G 3 6 10 4 Number of Absences Number of Absences (e) Would it be reasonable to use the least-squares regression line to predict the final exam score for a student who has missed 15 class periods? Why or why not? O A. Yes, because the absolute value of the correlation coefficient is greater than the critical value for a...
A psychologist wanted to assess the relationship between depression and self-esteem. She believes that as depression...
A psychologist wanted to assess the relationship between depression and self-esteem. She believes that as depression increases, self-esteem decreases. She asked a group of 25 participants to complete both Beck’s Depression Inventory (Beck, Ward, Mendelson, Mock, & Erbaugh, 1961) and Rosenberg’s Self-Esteem Scale (1965). The data for each participant is as follows: Depression (X) Self-Esteem (Y) 60 11 27 34 15 33 30 24 56 14 52 16 40 23 49 33 24 27 38 26 48 17 58 10...
The following data show the brand, price ($), and the overall score for six stereo headphones...
The following data show the brand, price ($), and the overall score for six stereo headphones that were tested by a certain magazine. The overall score is based on sound quality and effectiveness of ambient noise reduction. Scores range from 0 (lowest) to 100 (highest). The estimated regression equation for these data is ŷ = 20.455 + 0.335x, where x = price ($) and y = overall score. Brand Price ($) Score A 180 78 B 150 69 C 95...
The following data show the brand, price ($), and the overall score for six stereo headphones...
The following data show the brand, price ($), and the overall score for six stereo headphones that were tested by a certain magazine. The overall score is based on sound quality and effectiveness of ambient noise reduction. Scores range from 0 (lowest) to 100 (highest). The estimated regression equation for these data is ŷ = 23.064 + 0.309x, where x = price ($) and y = overall score. Brand Price ($) Score A 180 74 B 150 69 C 95...
2. (Based on Stock & Watson "Introduction to Econometrics 6th ed., Exercise 4.5.) A professor decides to run an experiment to measure the effect of time pressure on final exam scores. He...
2. (Based on Stock & Watson "Introduction to Econometrics 6th ed., Exercise 4.5.) A professor decides to run an experiment to measure the effect of time pressure on final exam scores. He gives each of the 400 students in her course the same final exam, but some students have 90 minutes to complete the exam, while others have 120 minutes. Each student is randomly assigned one of the examination times, based on the flip of a coin. Let y denote...
2. (11 pts.) Do creative people make better teachers? Ten
teachers at a large university were given a creativity test (scores
range from 0 to 20, with higher scores indicating greater
creativity) and were evaluated regarding teaching performance by
students and peers (a score of 100 indicates an average
performance, and larger scores indicate better performance). The
creativity scores and teaching performance scores are given
below.
Creativity score
Performance score
9
93
7
89
8
95
13
101
10
102...
The well-known psychologist Dr. Elbod has established what he calls his Generalized Anxiety Scale (GAS). The GAS, which is a scale from 0 to 10, measures the "general anxiety" of an individual, with higher GAS scores corresponding to more anxiety. (Dr. Elbod's assessment of anxiety is based on a variety of measurements, both physiological and psychological.) we're interested in making predictions about individuals' sleep behavior based on their GAS scores. The bivarlate data below give the GAS score (denoted by...
A health researcher does a study investigating the effect of exercise on stress levels in college students. Thery measure how much time a person spends exercising each day (in minutes), and the person's stress level. Below are the means, standard deviations, and correlations Time spent exercising per day Stress level x average: 35 average: 5 SD: 5 SD: 1, r -0.45 The researcher wants to use exercise time to predict stress levels (a) Time spent exercising is the.. x-variable y-variable...
Number of Absences Number of Absences Exam Scores vs. Absences Exam Scores vs. Absences Final Exam Score Final Exam Score G 3 6 10 4 Number of Absences Number of Absences (e) Would it be reasonable to use the least-squares regression line to predict the final exam score for a student who has missed 15 class periods? Why or why not? O A. Yes, because the absolute value of the correlation coefficient is greater than the critical value for a...
2. (Based on Stock & Watson "Introduction to Econometrics 6th ed., Exercise 4.5.) A professor decides to run an experiment to measure the effect of time pressure on final exam scores. He gives each of the 400 students in her course the same final exam, but some students have 90 minutes to complete the exam, while others have 120 minutes. Each student is randomly assigned one of the examination times, based on the flip of a coin. Let y denote...
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