Homework Answers
Answer
Pooled variance is used when we have same variance for two samples, but when the variances for two samples are not unequal, then we dont use pooled variance.
So, it is false
So, when variances between two samples are not equal in an independent sample t test, then pooled variance must not be computed.
Pooled variance is used only when two samples have same or equal variance.
Add Answer to:
uunt lailieu or à two-tailed Question 4 (1 point) When variances between two samples are not...
when variances between two samples are not equal in a paired sample t test, the pooled...
when variances between two samples are not equal in a paired sample t test, the pooled variance must be computed and used 8n place of the estimated standard error. t or f
Question 16 (1 point) A t-test equation can be used to estimate sample size and power? O 1) True ...
Question 16 (1 point) A t-test equation can be used to estimate sample size and power? O 1) True O 2) False Save Question 17 (1 point) The standard error the mean is not used in independent t tests? O 1) True O 2) False Save Question 18 (1 point) Before you determine the p-value of an independent t test you should first determine if the variances are equal. You havea greater chance of rejecting the null if the variances...
rowan.instructure.com Question 3 0.5 pts Which of the following are assumptions of the independent samples t-test?...
rowan.instructure.com Question 3 0.5 pts Which of the following are assumptions of the independent samples t-test? Skewed population Sample size over 30 Homogeneity of variance Related samples Question 4 0.5 pts What is the term called in an independent samples t-test that averages together the variances of the two samples? Mean variance Average variance Standard error of the difference Pooled variance Question 5 0.5 pts How is the standard error of the difference (used in independent samples t-tests) different from...
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 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...
For the independent-measures t test, which of the following describes the estimated standard error of M1 - M2 (whose sy...
For the independent-measures t test, which of the following describes the estimated standard error of M1 - M2 (whose symbol is )? O The variance across all the data values when both samples are pooled together O A weighted average of the two sample variances (weighted by the sample sizes) O The difference between the standard deviations of the two samples O An estimate of the standard distance between the difference in sample means (M, - M2) and the difference...
In "Small Independent samples about Population Mean" case, we usually assume the variances from the two...
In "Small Independent samples about Population Mean" case, we usually assume the variances from the two samples are "Equal" in scales. Therefore, we use the smaller standard deviation (or variance) found from the two samples to calculate the test statistic. use the larger standard deviation (or variance) found from the two samples to calculate the test statistic. calculate the average the two standard deviations (or variances) and use it to calculate the test statistic. calculate the pooled standard deviation (or...
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...
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...
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
Question 16 (1 point) A t-test equation can be used to estimate sample size and power? O 1) True O 2) False Save Question 17 (1 point) The standard error the mean is not used in independent t tests? O 1) True O 2) False Save Question 18 (1 point) Before you determine the p-value of an independent t test you should first determine if the variances are equal. You havea greater chance of rejecting the null if the variances...
rowan.instructure.com Question 3 0.5 pts Which of the following are assumptions of the independent samples t-test? Skewed population Sample size over 30 Homogeneity of variance Related samples Question 4 0.5 pts What is the term called in an independent samples t-test that averages together the variances of the two samples? Mean variance Average variance Standard error of the difference Pooled variance Question 5 0.5 pts How is the standard error of the difference (used in independent samples t-tests) different from...
For the independent-measures t test, which of the following describes the estimated standard error of M1 - M2 (whose symbol is )? O The variance across all the data values when both samples are pooled together O A weighted average of the two sample variances (weighted by the sample sizes) O The difference between the standard deviations of the two samples O An estimate of the standard distance between the difference in sample means (M, - M2) and the difference...
In "Small Independent samples about Population Mean" case, we usually assume the variances from the two samples are "Equal" in scales. Therefore, we use the smaller standard deviation (or variance) found from the two samples to calculate the test statistic. use the larger standard deviation (or variance) found from the two samples to calculate the test statistic. calculate the average the two standard deviations (or variances) and use it to calculate the test statistic. calculate the pooled standard deviation (or...
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...
Most questions answered within 3 hours.
-
You have been asked to develop a new line of organic skincare
products. Spend time with...
asked 7 minutes ago -
Summerdahl Resort's common stock is currently trading at $37 a
share. The stock is expected to...
asked 28 minutes ago -
To an economist, the field of industrial organization answers
which of the following questions?
asked 31 minutes ago -
How could meeting industry expectations, propel managers into
challenging and possible conflict of interest situations? How...
asked 55 minutes ago -
You have been married to your spouse for 10 years. You have two
small children (ages...
asked 2 hours ago -
Spiderman makes a leap from one building to
another. He starts on one building that is...
asked 2 hours ago -
A
symbol is something that stands for something else. What are the
symbols in education?what are...
asked 3 hours ago -
The charge to the left in the figure above has a
magnitude of 2.90 nC, and...
asked 4 hours ago -
Verify the MIRR is 9.29% given cash flows in years 1 and 2 of
$1,000 each,...
asked 5 hours ago -
Calculate the pH of a 5.7 M solution of aniline (C6H5NH2; Kb =
3.8 x 10^-10)
asked 7 hours ago -
LSL R3, R3, R12
Memory
Address
Orig.
Data
Updated
Data
Register
Orig.
Data
Updated
Data
0x84F0...
asked 7 hours ago -
Air at 100 kPa and density of 1.2 kg/m3 flows upward through a
5-cm diameter inclined...
asked 7 hours ago