Find the expectation of pooled estimate of variance when the variances are the same

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TOPIC:Expectation of the pooled estimate of the population variance.

orchestra answered 2 years ago

Differentiating pooled variance and the estimated standard error of the difference in sample means

Differentiating pooled variance and the estimated standard error of the difference in sample means For the independent-measures t test, which of the following describes the pooled variance (whose symbol is sp2 )? The difference between the standard deviations of the two samples The variance across all the data values when both samples are pooled together A weighted average of the two sample variances (weighted by the sample sizes) An estimate of the standard distance between the difference in sample means (M1 - M2) and the...

The within-groups estimate of variance is the estimate of the variance of the population of individuals...

The within-groups estimate of variance is the estimate of the variance of the population of individuals based on the variation among the: Group of answer choices Scores in each of the actual groups studied Mean of the groups minus the mean of the scores of the actual groups Equal to the between-groups estimate of population variance Means of the groups studied

1. When we state that there is homogeneity of variance, precisely which variances are homogeneous? Use...

1. When we state that there is homogeneity of variance, precisely which variances are homogeneous? Use words, not symbols. 2. It is important to keep the probability of making Type I equal to α. With a t-test, how do we keep the probability of Type I error in check?

In calculating budget variances the total variance was broken down into various components, when added up...

In calculating budget variances the total variance was broken down into various components, when added up they totaled the total variance. Explain why this is helpful in determing problems and in identifying the corrective action that should be taken to resolve the problems

You should use a pooled t-test versus a non-pooled t-test when the samples are matched. the...

You should use a pooled t-test versus a non-pooled t-test when the samples are matched. the variance of the two populations are equal. the sample sizes of both groups are the same. None of these the samples are matched and the sample sizes of both groups are the same.

Consider the following statements concerning confidence interval estimates: A. The use of the pooled variance estimator...

Consider the following statements concerning confidence interval estimates: A. The use of the pooled variance estimator when constructing a confidence interval for the difference between means requires the assumption that the population variances are equal. B. The width of a confidence interval estimate for the proportion, or for mean when the population standard deviation is known, is inversely proportional to the square root of the sample size. C. To determine the sample size required to achieve a desired precision in...

a. Describe the Pooled variance assumption. How does it change the standard error? What impact does...

a. Describe the Pooled variance assumption. How does it change the standard error? What impact does it have on a test statistic? What impact does it have on a p-value? How do you justify making the assumption? HTML EditorKeyboard Shortcuts b. Republican Democrat Libertarian Support 18 24 8 Don't Support 14 12 5 The above contingency table was created by asking a sample of people in a given area if they support a measure taken by the government. If The...

Calculate the pooled estimate of σ2, the associated degrees of freedom, and the observed value of the t statistic.

Use the information provided to answer the questions. Population 1= 11 3 9 4 Population 2= 13 7 7 9 6 5 Calculate the pooled estimate of σ2, the associated degrees of freedom, and the observed value of the t statistic. (Round s2 and your t statistic to three decimal places.) S(squared) = df = t = What is the rejection region using α = 0.05? (If the test is one-tailed, enter NONE for the unused region. Round your answers...

What exactly does the pooled variance in an independent samples t-test tell us?Why is it necessary...

What exactly does the pooled variance in an independent samples t-test tell us?Why is it necessary to modify this formula for unequal values of n?

Differentiate between planning and operational variances Briefly explain the following terms Planning Variance: Operational Variance:

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