A researcher has two samples of participants, and each sample experiences a different level of the...
- A researcher has two samples of participants, and each sample experiences a different level of the independent variable. Sample A has 8 participants and Sample B has 10 participants. The corrected variance for Sample A is 7.71 and the corrected variance for Sample B is 9.34.
- What is the pooled degrees of freedom between the 2 samples? (hint: you shouldn’t use the pooled variance equation).
- Find the pooled variance using the pooled variance equation.
- c . Add the two variance versions of standard errors together and square root the result to find the standard error.
- Using the total degrees of freedom, find the cutoff values for the two-tailed test at an alpha level of 0.05.
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A researcher has two samples of participants, and each sample
experiences a different level of the...
A researcher has two samples of participants, and each sample experiences a different level of the...
A researcher has two samples of participants, and each sample experiences a different level of the independent variable. Sample A has 8 participants and Sample B has 10 participants. The corrected variance for Sample A is 7.71 and the corrected variance for Sample B is 9.34. What is the pooled degrees of freedom between the 2 samples? (hint: you shouldn’t use the pooled variance equation). Find the pooled variance using the pooled variance equation. Convert the pooled variance to variance...
A researcher conducts an experiment consisting of two groups—Group 1, non-smokers, and Group 2, ex-smokers. Group...
A researcher conducts an experiment consisting of two groups—Group 1, non-smokers, and Group 2, ex-smokers. Group 1 consists of 10 participants, while Group 2 has 12 participants. If the researcher conducts a two-tailed two-independent sample t-test, what will the degrees of freedom and the critical values at a 0.05 level of significance be? (Round your critical values to three decimal places.) degrees of freedom critical value (smaller value) critical value (larger value)
one sample has ss=36 and a second sample has ss=18 If n=4 for both samples, find...
one sample has ss=36 and a second sample has ss=18 If n=4 for both samples, find each of the sample variances and compute the pooled variance. Because the samples are the same size, you should find that the pooled variance is exactly halfway between the two sample variances. The first sample has ________ (choose one of the following 12.00, 9.00, 6.00, 3.00), and the second has s^2=______((choose one of the folloeing 12.00, 6.00, 3.00, 4.50). The pooled variance is s^2p=________(9.00,...
Let's say that a researcher conducts a study with 3 groups, each with 6 participants. Fill...
Let's say that a researcher conducts a study with 3 groups, each with 6 participants. Fill in the degrees of the following ANOVA table. freedom in df Source Between Within Total MS 34.43 6.95 F 4.95 D 17 Use the following Distributions tool to find the boundary for the critical region at a = .05 and - .01. To use the tool to find the critical F value, set both the numerator and the denominator degrees of freedom; this will...
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...
PLEASE help ?? A researcher conducted a single sample t-test on results of an experiment with...
PLEASE help ??
A researcher conducted a single sample t-test on results of an experiment with n = 18 participants and the computed t = -2.28. What is the correct conclusion from this experiment if p < 0.05, 2-tails test is used for hypothesis testing? O A. The researcher failed to reject the null hypothesis and concluded that there is a significant treatment effect. O B. The researcher rejected the null hypothesis and concluded that there is a significant treatment...
* For large samples one sample t-tests (n >120) use critical t scores of ±1.96 (for...
* For large samples one sample t-tests (n >120) use critical t scores of ±1.96 (for 95% confidence level two tailed test) or ±1.65 (for 95% confidence level one tailed test). * For small samples (n<120) use critical t score obtained from t-distribution table. You will need to calculate degrees of freedom, which is simply the sample size minus 1 (df = n-1) and use an alpha value of .05. * For comparing means between two samples (regardless of sample...
21) A researcher wants to know whether there is a difference in the physical activity level of children during the morni...
21) A researcher wants to know whether there is a difference in the physical activity level of children during the morning and afternoon. He observes a total of 40 children (20 boys and 20 girls) from randomly selected schools during morning and afternoon recess and gives each child a score (out of 50) based on how much of the time they spend sitting, standing, walking or running. Each child receives a score in the morning and another in the afternoon....
A researcher records the following scores on a working memory quiz for two samples. Which sample...
A researcher records the following scores on a working memory quiz for two samples. Which sample has the laegest standard deviation? Sample A: 2,3,4,5,6,7 and 8 Sample B: 4,5,6,7,8,9, and 10
A researcher collects two independent random samples of sizes n = 22 and n2 = 27,...
A researcher collects two independent random samples of sizes n = 22 and n2 = 27, and computes the means, x, and x2 and the standard deviations, s, and s2, of each sample. She plans to use a t-test to determine if there is a difference between the two population means, Hi and 2. She does not know the population standard deviations, nor does she have any reason to believe that they are equal. Using the most conservative approach, calculate...
Let's say that a researcher conducts a study with 3 groups, each with 6 participants. Fill in the degrees of the following ANOVA table. freedom in df Source Between Within Total MS 34.43 6.95 F 4.95 D 17 Use the following Distributions tool to find the boundary for the critical region at a = .05 and - .01. To use the tool to find the critical F value, set both the numerator and the denominator degrees of freedom; this will...
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...
PLEASE help ??
A researcher conducted a single sample t-test on results of an experiment with n = 18 participants and the computed t = -2.28. What is the correct conclusion from this experiment if p < 0.05, 2-tails test is used for hypothesis testing? O A. The researcher failed to reject the null hypothesis and concluded that there is a significant treatment effect. O B. The researcher rejected the null hypothesis and concluded that there is a significant treatment...
A researcher collects two independent random samples of sizes n = 22 and n2 = 27, and computes the means, x, and x2 and the standard deviations, s, and s2, of each sample. She plans to use a t-test to determine if there is a difference between the two population means, Hi and 2. She does not know the population standard deviations, nor does she have any reason to believe that they are equal. Using the most conservative approach, calculate...
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