Question

A study finds that the correlation between the number of students in a class and students’...

A study finds that the correlation between the number of students in a class and students’ grades in the class is r= -.65. What does this relationship suggest? What is the proportion of variance accounted for by the association? Should the college take any action based on this study? Explain why or why not.

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

The correlation between the number of students in a class and students’ grades in the class is r= -.65. This correlation suggest that there is negative relationship between the number of students in a class and students’ grades. It means, as number of students in a class increases the students’ grades decreases.

The proportion of variance accounted for by the association is, r2 = (-0.65)2 = 0.4225

Yes, The college should take any action based on this study. because there is negative relationship between the number of students in a class and students’ grades. Actually the relationship between the number of students in a class and students’ grades should be positive.

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Jacob finds a correlation of .55 between scores on a newly developed questionnaire to measure determination...
Jacob finds a correlation of .55 between scores on a newly developed questionnaire to measure determination to succeed and grades at Tarrant County College (TCC). 12) Based on this correlation, we can explain or predict how much of the variability in grades at TCC by students’ determination to succeed score? What two other factors might account for the unexplained the variance in student grades?
a. Explain the meaning of the finding that there is a negative correlation between class attendance...
a. Explain the meaning of the finding that there is a negative correlation between class attendance (number of absences) and achievement in class (as measured by the final examination). Use the concept of r square in your explanation. b. A research article reports that there is 60% common association (or shared variance) between the scores on two measures. Explain what this means. How did they get the 60%? What was the correlation?
2.  An educational psychologist gathers data from a sample of college students.  He finds the correlation between grade...
2.  An educational psychologist gathers data from a sample of college students.  He finds the correlation between grade point average and class attendance to be 0.60, and he finds the correlation between grade point average and amount of time spent playing video games to be -0.60.    What can the educational psychologist conclude about these correlations? The correlation of r = 0.60 is stronger than the correlation of r = -0.60. The correlation of r = 0.60 is just as strong as the correlation...
Suppose a random sample of 25 students found a correlation of r = –.53 between number...
Suppose a random sample of 25 students found a correlation of r = –.53 between number of absences and final grade. Is this enough evidence to conclude that there is a relationship between absences and final grades in general? Use α = .05, two -tailed. Use “Tr” technique. write up also
a.) A study of class attendance and grades among first-year students at a state university showed...
a.) A study of class attendance and grades among first-year students at a state university showed that in general students who attended a higher percent of their classes earned higher grades. Class attendance explained r2 = 64% of the variation in grade index among the students. What is the numerical value of the correlation between percent of classes attended and grade index? (Use 2 decimal places.) b.) An opinion pollster asks 100 college seniors how they view their job prospects....
An epidemiologic study finds a statistically significant association between phthalate ester exposure and clinical diagnosis of...
An epidemiologic study finds a statistically significant association between phthalate ester exposure and clinical diagnosis of metabolic syndrome. Identify and explain four factors that should be considered in evaluating whether this statistical association is to be considered a causal relationship.
A community college professor is interested in determining the relationship between the number of posts students...
A community college professor is interested in determining the relationship between the number of posts students make on Schoology and their respective grades. He planned to correlate the results from a sample from all his classes, however, due to time constraints, he decided to sample only from students with high grades. As his statistical consultant, state whether or not you support his plans and why.
In a study investigating how students use their laptop computers in class, researchers recruited 45 students...
In a study investigating how students use their laptop computers in class, researchers recruited 45 students who regularly take their laptops to class. Software was installed on each of their computers that logged information on the applications the computer was running, including how long each was open and which was the primary focus on the monitor. Logs were kept over multiple lectures. On average, the students cycled through 65 active windows per lecture, with one student averaging 174 active windows...
36. A researcher wants to examine if there is a correlation between number of work hours...
36. A researcher wants to examine if there is a correlation between number of work hours per week and academic performance in a sample of n = 150 undergraduate students. What will be the null hypothesis, if she plans to use a two-tailed Person’s correlation test in data analysis? A. There is a significant correlation between number of work hours per week and academic performance in the population of undergraduate students. B. There is a significant positive correlation between number...
1. A researcher conducts a survey to determine the relationship between aptitude for mathematics and musical...
1. A researcher conducts a survey to determine the relationship between aptitude for mathematics and musical ability. She finds a perfect relationship. High levels of mathematics aptitude are associated with low levels of musical ability. Given this information, what is the value of the correlation coefficient for the above study? ______________ 2. You obtain a score of 80 on a test. If the test is graded on a ‘curve’ (based on how you did in comparison with the class as...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT