Considering the differences between a one-tailed and two-tailed independent samples t-test, using the same data set,...
Considering the differences between a one-tailed and two-tailed independent samples t-test, using the same data set, which of the following is NOT true:
A. the calculated t statistic will be the same for both
B. an F-test of variances is required in both cases
C. the d.f. will be the same for both tests
D. we should select different values for these tests
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Considering the differences between a one-tailed and two-tailed
independent samples t-test, using the same data set,...
Using the following data set, conduct an independent samples t-test. Use a= 0.05 and a two-tailed...
Using the following data set, conduct an independent samples t-test. Use a= 0.05 and a two-tailed test. Sample 1: 14, 14, 13, 13, 10, 12, 14, 15, 17 Sample 2: 15, 11, 15, 13, 14, 13, 14, 14, 15 1. hypotheses: null and alternative 2. t-critical value; shade of regions of rejection 3. t-obtain 4. conclusion 5. decide if significant 6. compute for confidence interval is significant
6. The t test for two independent samples - One-tailed example using tables Aa Aa Most...
6. The t test for two independent samples - One-tailed example using tables Aa Aa Most engaged couples expect or at least hope that they will have high levels of marital satisfaction. However, because 54% of first marriages end in divorce, social scientists have begun investigating influences on marital satisfaction. [Data source: This data was obtained from National Center for Health Statistics.] Suppose a counseling psychologist sets out to look at the role of economic hardship in relationship longevity. He...
QUESTION 11 You run an independent samples t-test between two groups, and find a t-statistic of...
QUESTION 11 You run an independent samples t-test between two groups, and find a t-statistic of t=1.67. Is this sufficient to reject the null hypothesis? Assume α=0.05 and a one-sided test. Yes, > 1.67 is sufficient to reject the null. No, > 1.67 is not sufficient to reject the null. Not enough information. 2 points QUESTION 12 In a dependent samples t-test, the sample sizes must be equal. True False 2 points QUESTION 13 In an independent samples...
3. The t test for two independent samples- Two-tailed example AaAa? Bullying," according to noted expert...
3. The t test for two independent samples- Two-tailed example AaAa? Bullying," according to noted expert Dan Olweus, "poisons the educational environment and affects the leaning of every child." Bullying and victimization are evident as early as preschool, with the problem peaking in middle school. Suppose you are interested in the emotional well-being of not only the victims but also bystanders, bullies, and those who bully but who are also victims (bully-victims). You decide to measure depression in a group...
Compare and contrast the differences between a single sample t test and an independent samples t...
Compare and contrast the differences between a single sample t test and an independent samples t test. Next describe a hypothetical study using the design of an independent samples t test. List the two groups that you would test.
Problem 5. (20 points) We have k independent samples from normal distributions with the same variances. We want to test the global hypothesis that all population means are the same. We decided to byp...
Problem 5. (20 points) We have k independent samples from normal distributions with the same variances. We want to test the global hypothesis that all population means are the same. We decided to bypass the ANOVA step and carry out t-tests to assess the differences between all pairs of means. Find the type I error rate for the global test (at alpha level of 0.05) if we use alpha level of 0.05 for each t-test (this shows why adjustments like...
Suppose you are planning to use a t test for independent groups to tast the following one-tailed ...
Suppose you are planning to use a t test for independent groups to tast the following one-tailed hypotheses you want to maximize the power of your study, you are considering which factors might increase power so th can adjust your plans to incorporate them, if possible, before conducting your research you The following are your considerations for increasingp ower. Fill in any missing words/values. (Hint: Remember that for this alternative hypothesis, you will reject the null hypothesis for large values...
Question 1 (1 point) When we compute an independent-samples t-test, we are looking to see if...
Question 1 (1 point) When we compute an independent-samples t-test, we are looking to see if there are significant differences between the means of two independent groups, each measured on a different level of the independent variable. al True b) False Question 2 (2 points) When we compute a paired-samples &-test, we are looking to see if there are significant differences between the means of two independent groups, each measured on a different level of the independent variable. a) True...
uunt lailieu or à two-tailed Question 4 (1 point) When variances between two samples are not...
uunt lailieu or à two-tailed Question 4 (1 point) When variances between two samples are not equal in an independent-sample t- test, the pooled variance must be computed and used in place of the estimated standard error. a) True b) False
10. The t test for two independent samples - One-tailed example using tables Most engaged couples...
10. The t test for two independent samples - One-tailed example using tables Most engaged couples expect or at least hope that they will have high levels of marital satisfaction. However, because 54% of first marriages end in divorce, social scientists have begun investigating influences on marital satisfaction. [Data source: This data was obtained from the National Center for Health Statistics.] Suppose a clinical psychologist sets out to look at the role of sexual orientation in relationship longevity. He decides...
6. The t test for two independent samples - One-tailed example using tables Aa Aa Most engaged couples expect or at least hope that they will have high levels of marital satisfaction. However, because 54% of first marriages end in divorce, social scientists have begun investigating influences on marital satisfaction. [Data source: This data was obtained from National Center for Health Statistics.] Suppose a counseling psychologist sets out to look at the role of economic hardship in relationship longevity. He...
3. The t test for two independent samples- Two-tailed example AaAa? Bullying," according to noted expert Dan Olweus, "poisons the educational environment and affects the leaning of every child." Bullying and victimization are evident as early as preschool, with the problem peaking in middle school. Suppose you are interested in the emotional well-being of not only the victims but also bystanders, bullies, and those who bully but who are also victims (bully-victims). You decide to measure depression in a group...
Problem 5. (20 points) We have k independent samples from normal distributions with the same variances. We want to test the global hypothesis that all population means are the same. We decided to bypass the ANOVA step and carry out t-tests to assess the differences between all pairs of means. Find the type I error rate for the global test (at alpha level of 0.05) if we use alpha level of 0.05 for each t-test (this shows why adjustments like...
Suppose you are planning to use a t test for independent groups to tast the following one-tailed hypotheses you want to maximize the power of your study, you are considering which factors might increase power so th can adjust your plans to incorporate them, if possible, before conducting your research you The following are your considerations for increasingp ower. Fill in any missing words/values. (Hint: Remember that for this alternative hypothesis, you will reject the null hypothesis for large values...
Question 1 (1 point) When we compute an independent-samples t-test, we are looking to see if there are significant differences between the means of two independent groups, each measured on a different level of the independent variable. al True b) False Question 2 (2 points) When we compute a paired-samples &-test, we are looking to see if there are significant differences between the means of two independent groups, each measured on a different level of the independent variable. a) True...
uunt lailieu or à two-tailed Question 4 (1 point) When variances between two samples are not equal in an independent-sample t- test, the pooled variance must be computed and used in place of the estimated standard error. a) True b) False
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