Use the following information to answer questions 19-27. A psychologist is interested in measuring the difference in level of depression levels in the winter and summer. She predicts that depression is higher in the winter. The psychologist recruited 30 participants and measured their level of depression once in the winter and again in the summer. The average difference score was computed by subtracting the summer scores from the winter scores (winter - summer) and is 10. The variance of the difference scores is 3. Conduct the appropriate t test with an alpha of .05. Which of the following is the correct null hypothesis? O HD <0 O HD > 0 O HD SO O HD=0 Which critical t value marks the boundaries of the critical region? O 2.045 O -2.045 O 1.699 O -1.699 Compute the standard error of the mean of the difference scores. O 0.10 O 1.73 O 0.55 O 0.32 Compute the t statistic. O 1.62 O-31.25 O -1.62 O 31.25 What is the correct decision? O Fail to reject the null hypothesis O Accept the null hypothesis O Reject the alternative hypothesis O Reject the null hypothesis When should you use a single sample t instead of a z-score? O When comparing a sample to the population and the population standard deviation is not given O When comparing two samples O When comparing two conditions for a single sample O When you are comparing two samples matched on individual differences What should the researcher conclude? O Summer makes people depressed O People are no more depressed in the winter than they are in the summer. O People are more depressed in the winter. O People are more depressed in the summer. Compute the 99% confidence interval. O 9.12, 10.88 O 9.22, 10.78 O 0.00, 20.00 O9.46, 10.54 Compute the estimated Cohen's d. 3.33 O 17.78 O 31.62 O 5.77 Compute the proportion of variance explained by the dependent measure (²). O 0.09 O 0.97 O 0.06 O 0.52
Use the following information to answer questions 19-27. A psychologist is interested in measuring the difference in level of depression levels in the winter and summer. She predicts that depression is higher in the winter. The psychologist recruited 30 participants and measured their level of depression once in the winter and again in the summer. The average difference score was computed by subtracting the summer scores from the winter scores (winter - summer) and is 10. The variance of the difference scores is 3. Conduct the appropriate t test with an alpha of .05. Which of the following is the correct null hypothesis? O HD <0 O HD > 0 O HD SO O HD=0 Which critical t value marks the boundaries of the critical region? O 2.045 O -2.045 O 1.699 O -1.699 Compute the standard error of the mean of the difference scores. O 0.10 O 1.73 O 0.55 O 0.32 Compute the t statistic. O 1.62 O-31.25 O -1.62 O 31.25 What is the correct decision? O Fail to reject the null hypothesis O Accept the null hypothesis O Reject the alternative hypothesis O Reject the null hypothesis When should you use a single sample t instead of a z-score? O When comparing a sample to the population and the population standard deviation is not given O When comparing two samples O When comparing two conditions for a single sample O When you are comparing two samples matched on individual differences What should the researcher conclude? O Summer makes people depressed O People are no more depressed in the winter than they are in the summer. O People are more depressed in the winter. O People are more depressed in the summer. Compute the 99% confidence interval. O 9.12, 10.88 O 9.22, 10.78 O 0.00, 20.00 O9.46, 10.54 Compute the estimated Cohen's d. 3.33 O 17.78 O 31.62 O 5.77 Compute the proportion of variance explained by the dependent measure (²). O 0.09 O 0.97 O 0.06 O 0.52
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Use the following information to answer questions 19-27.
A psychologist is interested in measuring the difference in level of depression levels in the winter and summer. She predicts that depression is higher in the winter. The psychologist recruited 30
participants and measured their level of depression once in the winter and again in the summer. The average difference score was computed by subtracting the summer scores from the winter
scores (winter - summer) and is 10. The variance of the difference scores is 3. Conduct the appropriate t test with an alpha of .05.
Which of the following is the correct null hypothesis?
OHD <0
O
HD > 0
O HD 50
O HD = 0
Which critical t value marks the boundaries of the critical region?
O 2.045
O -2.045
O 1.699
O -1.699
Compute the standard error of the mean of the difference scores.
O 0.10
O 1.73
O 0.55
O 0.32
Compute the t statistic.
O 1.62
O-31.25
O -1.62
O 31.25
What is the correct decision?
O Fail to reject the null hypothesis
O Accept the null hypothesis
O Reject the alternative hypothesis
O Reject the null hypothesis
When should you use a single sample t instead of a z-score?
O When comparing a sample to the population and the population standard deviation is not given
When comparing two samples
O When comparing two conditions for a single sample
When you are comparing two samples matched on individual differences
Compute the 99% confidence interval.
O9.12, 10.88
9.22, 10.78
O 0.00, 20.00
9.46, 10.54
Compute the estimated Cohen's d.
O 3.33
O 17.78
31.62
O 5.77
What should the researcher conclude?
O Summer makes people depressed
O People are no more depressed in the winter than they are in the summer.
O People are more depressed in the winter.
O People are more depressed in the summer.
Compute the proportion of variance explained by the dependent measure (r²).
O 0.09
O 0.97
O 0.06
O 0.52
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