Degrees of freedom df - Study guides, Class notes & Summaries

Correlation does not imply... - causation The covariance ___ as the two variables show a ___ to ___ together. - increases, greater tendency, vary If your null hypotheses is ____ then there is ___. - (rho) = 0, no correlation What are the degrees of freedom for Pearson's r? - df = N-2 rho - null hypothesis value (r) bivariate outlier - an outlier with two variables that don't correlate Use Pearson's r for - reliability criterion validity measures the degree of association between 2 va...

BESC Final Exam Answers Current Update (100% Pass) Which inferential test should be used to compare two sample means to each other? - Answers -The two-sample t-test The most important difference between Cohen's d and the t-test is that Cohen's d ... - Answers -is not affected by sample size What is the formula for the degrees of freedom (df) for a two-sample t-test? - Answers -n-2 If a researcher wants to compare the effects of an antidepressant to the effects of a placebo on level...

I am using x to predict y. When I know the value of x, the mean-squared-error of my estimate of y is less than when I don't know x. - answers-x explains some of the variance in y If the SSmodel is greater than the SSresidual... - answers-the model accounts for more than 50% of the total variance What is the coefficient of determination? - answers-The proportion of variance accounted for in the dependent variable by the predictor variables. What is the relationship between r and beta in...

Type I error (alpha) - Answer-False positive results ex: reject the null hypothesis when you should accept it Type II error (beta) - Answer-False negative results ex: accept the null hypothesis when you should reject it Which inferential test should be used to compare two sample means to each other? - Answer-the two-sample t-test the most important difference between cohen's d and the t-test is that cohen's d - Answer-is not affected by sample size what is the formula for t...

Stroke recovery: Anatomy and outcomes correct answer: Anatomical influence d/t: -Recovery of ischemic penumbra via reperfusion -Resolution of cerebral edema -Neuroplasticity & rehab Better outcomes with: -Early medical care and intensive multidisciplinary rehab -Small strokes -Specialized stroke care centers Stroke rehab: Prognosis correct answer: Majority gain independence with function -Poor predictor for fn: no motor return 4 weeks post (flaccidity) Post-stroke PT goals:...

values that organize and describe the characteristics of a collection of data sometimes called a data set. - descriptive statistics tools that are used to make infer characteristics of a population, based on data from that population. - inferential statistics a subset of the population - sample all the possible subjects or cases of interests - population A method of investigation used to demonstrate cause-and-effect relationships by purposely manipulating variable(s) thought to produ...

BUS 240 TEST 4 | QUESTIONS WITH VERIFIED ANSWERS A national manufacturer of ball bearings is experimenting with two different processes for producing precision ball bearings. It is important that the diameters be as close as possible to an industry standard. The output from each process is sampled and the average error from the industry standard is measured in millimeters. The results are shown on the table. The researcher is interested in determining whether there is evidence that the two pr...

PSYC 515 Module 5: Week 5 Quiz: Non-parametric Tests Concepts Score for this quiz: 50 out of 50 Submitted Jul 18 at 7:13am This attempt took 21 minutes. Question 1 0 / 0 pts I have read and understand the Academic Honor policy as outlined in the Online Honor Code for Liberty University Online. I agree to abide by this policy and that the work submitted herein is my own. Yes No Question 2 2 / 2 pts Wilcoxon rank-sum test is to _____ as Wilcoxon matched-pairs signed-ranks T test is to _____. ordin...

I am using x to predict y. When I know the value of x, the mean-squared-error of my estimate of y is less than when I don't know x. - answer-x explains some of the variance in y If the SSmodel is greater than the SSresidual... - answer-the model accounts for more than 50% of the total variance What is the coefficient of determination? - answer-The proportion of variance accounted for in the dependent variable by the predictor variables. What is the relationship between r and beta in a ...

PSYC 515 Module 5: Week 5 Quiz: Non-parametric Tests Concepts Score for this quiz: 50 out of 50 Submitted Jul 18 at 7:13am This attempt took 21 minutes. Question 1 0 / 0 pts I have read and understand the Academic Honor policy as outlined in the Online Honor Code for Liberty University Online. I agree to abide by this policy and that the work submitted herein is my own. Yes No Question 2 2 / 2 pts Wilcoxon rank-sum test is to _____ as Wilcoxon matched-pairs signed-ranks T test is to _____. ordin...