Question

Given the mean of the difference scores is 7.0, standard deviation of the difference scores is...

Given the mean of the difference scores is 7.0, standard deviation of the difference scores is 2.8, and there were 25 in the sample, solve for the following problems, showing all work to receive full credit:

6) Solve for the standard error of the difference scores:

Work:

Answer:

7) Calculate the correlated-groups t test to determine the tobt.

Work:

Answer:

8) If this is a non-directional test, what is the t cv?

(No work needed)

Answer:

Identify the statistical test that should be used to analyze the data for the following study:

9) Does a GRE prep course improve GRE scores? GRE practice test scores were compared before and after 40 students had taken a very expensive GRE prep course.

Answer:

Given a result of t (60) = 1.75 for a one-tailed paired samples t-test, answer the following:

10) What is the sample size?

Answer:

11) What is the tcv?

Answer:

12) What is the tobt?

Answer:

13) What should the researcher conclude (reject or fail to reject the null hypothesis)?

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

Homework Answers

Answer #1

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
Mary, the counselor, wants to test whether there is any meaningful difference in depression scores among...
Mary, the counselor, wants to test whether there is any meaningful difference in depression scores among women and men clients of hers. She has 13 women clients and 14 men clients. The mean depression score of men clients is 4.5, while that of women is 5.3. The pooled standard error is 0.5 of the two groups. Is there any gender difference in depression levels among her women and men clients? Indicate the null and research hypothesis. What test do you...
A sample of 42 observations has a mean of 103 and a population standard deviation of...
A sample of 42 observations has a mean of 103 and a population standard deviation of 7. A second sample of 61 has a mean of 100 and a population standard deviation of 9. Conduct a z-test about a difference in sample means using a 0.04 significance level and the following hypotheses:   H0: μ1 - μ2 = 0   H1: μ1 - μ2 ≠ 0 a) What is the correct decision rule? Reject H0 in favour of H1 if the computed...
An SAT prep course claims to improve the test score of students. The table below shows...
An SAT prep course claims to improve the test score of students. The table below shows the scores for seven students the first two times they took the verbal SAT. Before taking the SAT for the second time, each student took a course to try to improve his or her verbal SAT scores. Do these results support the claim that the SAT prep course improves the students' verbal SAT scores? Let d=(verbal SAT scores prior to taking the prep course)−(verbal...
An SAT prep course claims to improve the test score of students. The table below shows...
An SAT prep course claims to improve the test score of students. The table below shows the scores for seven students the first two times they took the verbal SAT. Before taking the SAT for the second time, each student took a course to try to improve his or her verbal SAT scores. Do these results support the claim that the SAT prep course improves the students' verbal SAT scores? Let d=(verbal SAT scores prior to taking the prep course)−(verbal...
Using the data below, perform descriptive statistics analyses (mean, standard deviation, variance) for scores before and...
Using the data below, perform descriptive statistics analyses (mean, standard deviation, variance) for scores before and after the vocabulary unit. Then, determine if there is a significant difference between the two sets of exam scores by performing a paired t test. Lastly, write a paragraph to convey the findings, using APA format. Vocabulary - Beginning of Unit:24,18,61,43,39,65,57,54,21,18,46,54,14,34,50,38,44,20,35,19, and 36 Vocabulary - End of Unit: 55,64,67,59,60,71,60,73,47,67,55,78,48,66,60,63,84,58,73,61 and 65
1a. Given: mean difference between men and women = 2.2; standard error of mean difference =...
1a. Given: mean difference between men and women = 2.2; standard error of mean difference = 0.8; n men = 61, n women = 61. Test the following null hypothesis at a=.05 Ho: u men = u women Ha: u men > u women You need to compute the t statistic, look up t critical value and make decision including likelihood of appropriate error. You don't have to compute the standard error of mean difference because it's given. 1b. Compute...
The null hypothesis states there will be no difference in scores on the ADS between those...
The null hypothesis states there will be no difference in scores on the ADS between those who receive the standard treatment program and those who receive the standard treatment program plus Mindfulness Therapy. The output from the analysis is below. The results are t(19) = 1.554, p = .137. Paired Sample Statistics Mean N Std Deviation Std. Error Mean Pair 1 Standard Std. Mindfulness 12.8000 10.9500 20 20 3.81962 4.28553 .85409 .95827 Paired Samples Correlations N Correlations Sig Pair 1...
SmArT Academy, an SAT test prep company, claims that their program improves student scores). A simple...
SmArT Academy, an SAT test prep company, claims that their program improves student scores). A simple random sample of 37 students took the SAT before taking the prep course and then again after taking the prep course. The average increase in their scores after taking the course was 40 points with a standard deviation of 120 points. What can we conclude about the SmArT Academy’s claim that the course improves scores? Use a significance level of α = 0.05 and...
In general, if the standard deviation of the difference scores increases, then what will happen to...
In general, if the standard deviation of the difference scores increases, then what will happen to the value of the calculated t statistic? a. it will get larger b. It may increase or may decrease. There is no consistent relationship between SD and the size of the t statistic. c. It will stay the same; the t statistic is not affected by the SD of the difference scores. d. it will get smaller
Given a population mean of 27.1 with a standard deviation of 8.4 and a sample size...
Given a population mean of 27.1 with a standard deviation of 8.4 and a sample size of 10, answer these questions: Part A: What is the standard deviation of the sampling distribution of x̄? Show your work. (5 points) Part B: What does the sample size need to be if you want the standard deviation of the sampling distribution of x̄ to be 2.8? Show your work. (5 points) (10 points)
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT