In paired t-test, what's the difference between using pooled variance and using the standard deviation of...
In paired t-test, what's the difference between using pooled variance and using the standard deviation of the difference to calculate p-value?
Homework Answers
When we assume ,Equal population variances of two populations in paired t-test, the POOLED VARIANCE provides a higher precision estimate of variance than the individual sample variances.
Whereas , if population variances are not assumed to be equal, Standard Deviation of the difference is used to calculate the p-value.
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In paired t-test, what's the difference between using pooled
variance and using the standard deviation of...
What is the difference between a One sample t-test, Unpooled t-test, Pooled t-test, Paired t-test...
What is the difference between a One sample t-test, Unpooled t-test, Pooled t-test, Paired t-test, and Mann Whitney U test? How do you know when to use each test?
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
Which of the following is a key difference between the t test and the z-test? a....
Which of the following is a key difference between the t test and the z-test? a. The t test requires the knowledge of the true population mean. b. The t test uses the sample variance in place of the population variance. c. The t test computes the standard error using the population standard deviation. d. All of these are differences between t and z.
Standard error for the independent measures t test relies on pooled variance taken by adding the...
Standard error for the independent measures t test relies on pooled variance taken by adding the sum of squares from the two sample groups together True False
which is a difference between the mean scores of two groups divided by the pooled standard...
which is a difference between the mean scores of two groups divided by the pooled standard deviation. is it Expected Estimate Effect Size, beta, Statistical Test or Alpha?
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...
12.16 Calculating the pooled standard deviation. An experiment was run to compare three groups. T...
12.16 Calculating the pooled standard deviation. An experiment was run to compare three groups. The sample sizes were 28, 33, and 102, and the corresponding estimated standard deviations were 2.7, 2.6, and 4.8. (a) Is it reasonable to use the assumption of equal standard deviations when we analyze these data? Give a reason for your answer. (b) Give the values of the variances for the three groups. (c) Find the pooled variance. (d) What is the value of the pooled...
What is the main difference between the variance and the standard deviation as measures of variability?...
What is the main difference between the variance and the standard deviation as measures of variability? standard deviation is variability around the median, whereas variance is variability around the mean standard deviation is squared variability around the mean, whereas variance is in the original units variance is for the population, whereas standard deviation is around the sample mean. variance is squared variability around the mean, whereas standard deviation is in the original units
Imagine that a researcher is conducting a paired-samples t test. She finds that the sample mean...
Imagine that a researcher is conducting a paired-samples t test. She finds that the sample mean difference is 5, the standard deviation of the difference scores is 15, and the sample size is 85. The researcher is also using a typical null hypothesis that proposes no differences between the relevant population means. Under these circumstances, what is the value of the paired-samples t statistic? Please retain a minimum of three decimal places for all steps (if relevant) and provide a...
When using the pooled variance t-test, if the sample size for the first group is 16...
When using the pooled variance t-test, if the sample size for the first group is 16 and the sample size for the second group is 25, how many degrees of freedom do we have when finding the critical values?
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...
12.16 Calculating the pooled standard deviation. An experiment was run to compare three groups. The sample sizes were 28, 33, and 102, and the corresponding estimated standard deviations were 2.7, 2.6, and 4.8. (a) Is it reasonable to use the assumption of equal standard deviations when we analyze these data? Give a reason for your answer. (b) Give the values of the variances for the three groups. (c) Find the pooled variance. (d) What is the value of the pooled...
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