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A team of researchers is interested in whether writing one's thoughts and feeling can affect physical health. This kind of writing is called expressive writing. Twenty students were recruited to take part in the study.15 students were randomly assigned to the expressive writing group to write about their thoughts and feelings. The other 15 students were randomly assigned to a control group where they wrote about their plan for the day. One month later all the students their overall level of physical health on a scale from O = very poor health to 100 =perfect health. The expressive writing group had a mean of 65 and an estimated variance of 87. The control group had a mean of 70 and an estimated variance of 90 (Use a significant level of 5% to determine the effect of expressive writing on physical health). This example is a t test of ("dependent samples" or "two independent samples" or "single sample") Population 1 can be students who engage in expressive writing (writing about one's feelings) ("True" or "False") Population 2 can be students who write about a neutral topic (writing about any topic) ("True" or "False") The alternative hypothesis states The null hypothesis states The total sample size is and the sample size for each group is The SS for the expressive writing group is The SS for the control writing group is The mean difference for this example is The pool variance is The estimated standard error is The total degree of freedom is The t cutoff(s) at 5% in this example is (are) (negative t) and (positive t) The t statistic is The decision is the null hypothesis ("reject" or "fail to reject") The Cohen's d is and represent effect size ("small" or "medium" or "large") (do a Cohen's d if applicable) With a 95% confidence interval and df = 18, we estimate that the mean difference between the two populations is somewhere between (use the negativet to get the answer) and (use the positive t get the answer) (hint: use the estimated standard error from this example)

A team of researchers is interested in whether writing one's thoughts and feeling can affect physical health. This kind of writing is called expressive writing. Twenty students were recruited to take part in the study.15 students were randomly assigned to the expressive writing group to write about their thoughts and feelings. The other 15 students were randomly assigned to a control group where they wrote about their plan for the day. One month later all the students their overall level of physical health on a scale from O = very poor health to 100 =perfect health. The expressive writing group had a mean of 65 and an estimated variance of 87. The control group had a mean of 70 and an estimated variance of 90 (Use a significant level of 5% to determine the effect of expressive writing on physical health). This example is a t test of ("dependent samples" or "two independent samples" or "single sample") Population 1 can be students who engage in expressive writing (writing about one's feelings) ("True" or "False") Population 2 can be students who write about a neutral topic (writing about any topic) ("True" or "False") The alternative hypothesis states The null hypothesis states The total sample size is and the sample size for each group is The SS for the expressive writing group is The SS for the control writing group is The mean difference for this example is The pool variance is The estimated standard error is The total degree of freedom is The t cutoff(s) at 5% in this example is (are) (negative t) and (positive t) The t statistic is The decision is the null hypothesis ("reject" or "fail to reject") The Cohen's d is and represent effect size ("small" or "medium" or "large") (do a Cohen's d if applicable) With a 95% confidence interval and df = 18, we estimate that the mean difference between the two populations is somewhere between (use the negativet to get the answer) and (use the positive t get the answer) (hint: use the estimated standard error from this example)

MATLAB: An Introduction with Applications
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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A team of researchers is interested in whether writing one's thoughts and feeling can affect physical health. This kind of writing is called expressive writing. Twenty students were recruited to take part in the study.15 students were randomly assigned to the expressive writing group to write about their thoughts and feelings. The other 15 students were randomly assigned to a control group where they wrote about their plan for the day. One month later all the students their overall level of physical health on a scale from 0 = very poor health to 100 =perfect health. The expressive writing group had a mean of 65 and an estimated variance of 87. The control group had a mean of 70 and an estimated variance of 90 (Use a significant level of 5% to determine the effect of expressive writing on physical health). This example is a t test of ("dependent samples" or "two independent samples" or "single sample") Population 1 can be students who engage in expressive writing (writing about one's feelings) ("True" or "False") Population 2 can be students who write about a neutral topic (writing about any topic) ("True" or "False") The alternative hypothesis states The null hypothesis states The total sample size is and the sample size for each group is The SS for the expressive writing group is The SS for the control writing group is The mean difference for this example is The pool variance is The estimated standard error is The total degree of freedom is The t cutoff(s) at 5% in this example is (are) (negative t) and (positive t) The t statistic is The decision is the null hypothesis ("reject" or "fail to reject") The Cohen's d is and represent effect size ("small" or "medium" or "large") (do a Cohen's d if applicable) With a 95% confidence interval and df = 18, we estimate that the mean difference between the two populations is somewhere between (use the negative t to get the answer) and (use the positive t get the answer) (hint: use the estimated standard error from this example)
Transcribed Image Text:A team of researchers is interested in whether writing one's thoughts and feeling can affect physical health. This kind of writing is called expressive writing. Twenty students were recruited to take part in the study.15 students were randomly assigned to the expressive writing group to write about their thoughts and feelings. The other 15 students were randomly assigned to a control group where they wrote about their plan for the day. One month later all the students their overall level of physical health on a scale from 0 = very poor health to 100 =perfect health. The expressive writing group had a mean of 65 and an estimated variance of 87. The control group had a mean of 70 and an estimated variance of 90 (Use a significant level of 5% to determine the effect of expressive writing on physical health). This example is a t test of ("dependent samples" or "two independent samples" or "single sample") Population 1 can be students who engage in expressive writing (writing about one's feelings) ("True" or "False") Population 2 can be students who write about a neutral topic (writing about any topic) ("True" or "False") The alternative hypothesis states The null hypothesis states The total sample size is and the sample size for each group is The SS for the expressive writing group is The SS for the control writing group is The mean difference for this example is The pool variance is The estimated standard error is The total degree of freedom is The t cutoff(s) at 5% in this example is (are) (negative t) and (positive t) The t statistic is The decision is the null hypothesis ("reject" or "fail to reject") The Cohen's d is and represent effect size ("small" or "medium" or "large") (do a Cohen's d if applicable) With a 95% confidence interval and df = 18, we estimate that the mean difference between the two populations is somewhere between (use the negative t to get the answer) and (use the positive t get the answer) (hint: use the estimated standard error from this example)
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