E(X(t)) = 0 and RX(t1,t2) = 1 2 cos(t2 t1), thus X(t) is WSS But X(0) and X( 4) do not have the same pmf (dierent ranges), so the rst order pmf is not stationary, and the process is not SSS For Gaussian random processes, WSS SSS, since the process is completely specied by its mean and autocorrelation functions b. Related (T/F), In the factorial ANOVA, participants are tested only once. (d) It can be meaningless to try to interpret 0 because The intercept coecient 0 measures the mean value of y when x equals zero. d. Indirect correlation, The coefficient of determination is equal to: a. p = .21 The t-test for independent means is used when you are looking at the difference in average scores of one or more variables within/between _______ group(s) that are _______ of one another. If you predict that a relationship between two variables would be either positive or negative, what type of test should you use? An autoregressive distributed lag model is estimated as y t = 11 + 0:7y t 1 0:4y t 2 + 9x t + 2x t 1 + u t Consider the e ect on yof a one-unit increase in xat time t where xremains one unit higher . d. Correlational analysis, More accurate predictions are associated with: Experimental statistic A _____________ is when there is more than one independent variable to predict an outcome. This page is about the various possible meanings of the acronym, abbreviation, shorthand or slang term: RXY . Question 20 1 pts The correlation between the two variables of interest is .81, which is significant at the .0637 level. b. 4) Is the sample correlation. The obtained value (.467) is greater than the critical value (.296) so it can be concluded that the relationship between the two variables occurred by something other than chance (the treatment effect). a. - Correlations can be used as a basis for the prediction of the value of one variable from the value of another. Compute each of the sets in if A={1,2,3,4},B={1,4,5},C={3,5,6}A=\{1,2,3,4\}, B=\{1,4,5\}, C=\{3,5,6\}A={1,2,3,4},B={1,4,5},C={3,5,6}, and the universal set is U={1,2,3,4,5,6}U=\{1,2,3,4,5,6\}U={1,2,3,4,5,6}. In a one-sample chi-square test, if your respondents are distributed very unequally across the levels of your variable, your chi-square value will be _______. Why or why not? In the result _((5))^2=9.4,p< .05, what is ^2? Students also viewed. If a research hypothesis does not predict the direction of a relationship, the test is _____. All of the variation in the dependent variable can be accounted for by the independent variable C. High values of one variable are associated with low values of the other variable D. Coefficient of nondetermination equals zero E. a. If your analysis notes that participants in a weight loss study differ in amount of weight lost based on the type of weight loss program used, what type of effect is this called? If a simple Pearson correlation value = .75, what percentage of variance is unaccounted for? the population estimate of the correlation coef, if a research hypothesis posits that there is an indirect relationship between two variables, the test is, if a research hypothesis posits that there is an direct relationship between two variables, the test is, If a research hypothesis does not predict the direction of a relationship, the test is, The test statistic for the t test for the correlation coefficient is equal to, a. number of pairs used to compute the correlation coefficient. Direct correlation The researcher has set alpha to .05 prior to conducting the analysis. 20. If b = -.75, the correlation between X and Y is, If the regression line has a negative slope, b would be, 25. True b. If a simple Pearson correlation value = .512, what percentage of variance is ACCOUNTED for? p < .05. Select one: The null hypothesis is rejected. d. Standardized error, Which of the following is the correct formula for linear regression? c. .66 d. Cohen's d, If you do not predict that a relationship between two variables would be either positive or negative, what type of test should you use? Which of the following is the Greek letter rho? d. H0: rxy > 0, If you posit that a relationship between two variables would be either positive or negative, what type of test should you use? Select one: O positive correlation univariate correlation neutral correlation o negative correlation Write a statement (that does not use the absolute value symbols) that is equivalent to 3-9 <0.3. (e) How to modify the regression so that the new 0 measures the mean value of y when x . .40 The square of the phi coefficient b. p = .01 Select one: In the result _((5))^2=9.4,p< .05, what is .05? What does r represent? If a simple Pearson correlation value = .685, what percentage of variance is ACCOUNTED for? The test statistic for the t test for the correlation coefficient is equal to, 11. 53 Select one: Select one: Select one: The question is how this variance compares with what the variance would have been if every subject had been in the same treatment condition. Indirect Question 7 1 pts Which of the following represents a possible alternative hypothesis for an analysis of variance (ANOVA)? 18. 2.97 d. Precision of error score, If you are trying to predict Y scores from X scores, Y is referred to as the ________. This chapter illustrates that you can also incorporate ___________ into the correlation coefficient. The statement rxy 0 represents the. b. When computing a correlation coefficient, if you have a degrees of freedom of 27, your sample size must be: When computing a correlation coefficient, if you have the degrees of freedom of 55, your sample size must be: If a simple Pearson correlation value = .512, what percentage of variance is accounted for? is used to predict a Y score from an X score. If a research hypothesis posits that there is an indirect relationship between two variables, the test is, 8. Answer: _____ Math Statistics and Probability. It just means a one element list containing just a 0. If the reactants less stable than the products, Gorxn is positive, and the reaction is endergonic. If there is no difference between what we expect and what we observe, the chi-square value would be equal to. True a. H1: rxy = 0 D. A z-score of -3 and +3 are the exact same distance from the population mean. d. None, If X decreases in value as Y increases in value, what type of correlation exists? In the following, what are the degrees of freedom: t(58) = 5.015, p < .01? b. n - 2 **Determining Differences** Determining the difference between two numbers is a matter of subtracting the smaller amount from the larger amount. c. 68% a. [Choose] c. a .45 d. 47000, Which of the following is like a standard deviation for all error scores in regression? Relative to mean the variable which has higher CV has higher spread and . Which of the following is another use of correlation coefficients? whichi is the formula for a one sample chi square test? b. If there is significant difference between the distributions of scores in two groups with effect size at .37, how big are the differences between the two groups? If there are three categories for which you are calculating a one-sample chi-square, what are the degrees of freedom? b. Y' c. Exercise causes weight loss. b. c. 56% There is a significant negative relationship between depression and anxiety in this sample. b. Two-tailed (T/F), Interaction effects are between independent variables. Select one: (T/F), If a dependent variable has a significant effect on the outcome variable, you have a main effect. Income is the __________ variable, while level of education is the ___________ variable. Sum of squares between groups = 37 2. When the correlation is perfect ( +1.0 or -1.0). c. .44 What three questions can you answer by doing a 2 x 2 factorial analysis? In the equation Y' = 0.650 (X) + 0.750, the "0.650" represents the. $$ The researcher collected data from a sample of 18 participants who were classified in one of three groups: (1) 6 players who received no special practice, (2) 6 players who spent 30 minutes just imagining that they were shooting baskets, and (3) 6 players who spent 30 minutes actually practicing shooting baskets. If variables change in the same direction, what type of correlation is this called? In the result _((3))^2=8.4,p< .05, what is .05? 2. .35 Null hypothesis H0: xy = 0, Write an example of research hypothesis for a one-tailed t-test for the correlation coefficient. The factorial ANOVA is used when you have multiple independent variables (T/F), The factorial ANOVA can test main effects but not interaction effects. d. 87%, If a simple Pearson correlation value = .75, what percentage of variance is unaccounted for? grade level academic performance television viewing students . c. The square root of the Pearson product-moment correlation coefficient d. The square root of the phi coefficient, the amount of unexplained variance in a relationship between two variables is called: 40000 Question 2 5 pts A researcher is interested in examining whether different practice strategies have an influence on the accuracy of basketball players' free throws. There is a significant positive relationship between depression and anxiety in this sample. c. Pearson's product-moment correlation coefficient Select one: Which of the following types of reliability correlates scores on a single measure on two different occasions? 1. A 585858-year-old couple are considering opening a business of their own. One-tailed test H1: rxy > 0 or H1: rxy < 0 b. Two-tailed test H1: rxy 0 In the equation r(65) = .45, p < .05, what are the degrees of freedom? a. In the equation Y' = 0.650 (X) + 0.750, the "X" represents the, 30. Continuous The obtained value (.213) is less than the critical value (.2875) so it cannot be concluded that the relationship between the two variables occurred by something other than chance. Which of the following is another use of correlation coefficients. Which of the following is NOT a type of reliability? with means X and Y. Ourversionofrst-orderlogicwillusethe followingsymbols: .34 .19 One of the most frequently used calculations is the Pearson product-moment correlation (r) that looks at linear relationships. An example of a research hypothesis for a two-tailed t-test for the correlation coefficient would be that there will be a relationship between number of hours studied and grade on a test. In a recent ____________ is a commonly used name for the one-sample chi-square test. (T/F). The t test for the correlation coefficient is most appropriate to use when, c. the relationship between two variables is being examined, 2. Dr. Moo would like to compute the exact probability of male or female students passing or failing on the comprehensive agricultural exam. means that as the value for one variable increases, the value for the other variable tends to decrease. In the formula for a one-sample chi-square test, E stands for, 11. d. Phi coefficient, A positive correlation between two variables would be represented in a scatterplot as: Which of the following represents the test statistic for a correlation coefficient? - the predicted score or criterion, - independent (predictor) variable Nonparametric statistics are known as _______. Write the equations for a research hypothesis with a one-tailed test and for a research hypothesis with a two-tailed test. In a factorial ANOVA, one of the research hypotheses for a main effect might look like. d. .90, If the coefficient of determination between two variables is .81, what is the coefficient of alienation? When analysis of data reveals differential effects of one factor across levels of another factor, what is this called? As such, a statement is an assertion that something is or is not the case. The strength of any relationship naturally depends on the specific pair of variables. Suppose sunrise causes you to wake up. c. Line graph In the equation r(65) = .45, p < .05, what are the degrees of freedom? 36% 47% b. The obtained value is c. F test If a research hypothesis does not predict the direction of a relationship, the test is __________. When using multiple regression, it is always best to include as many predictor variables as possible. We follow standard hypothesis test procedures in conducting a hypothesis test for the population correlation coefficient . Which of the following would be the most appropriate test statistic to use? Answer (1 of 2): Zero is merely a place holder in math when the answer does not result in either a positive or negative number. False. - Shows the amount of variance that is NOT explained, shared or in common (specific variance) -1.0 to 1.0. c. -2.0 to 2.0. d. -3.0 to 3.0. a. c. .504 a. d. 75%, If the alpha level = 0.05, which of the following indicates a significant correlation? Which of the following is NOT a type of reliability? Select one: Select one: 2. there is no difference between the levels of the second factor False, If two variables are significantly correlated, this means that one variable causes the other. Select one: This method of correlation attempts to draw a line of best fit through the data of two variables, and the value of the Pearson correlation coefficient, r, indicates how far away all these data points are to this line of best fit. Research hypothesis. O It cannot be determined. Sum of squares within groups = 21.45 Based on this information, match each of the following with the correct answer: The degrees of freedom between groups [Choose] The degrees of freedom within groups [Choose] Mean squares between groups [Choose] Mean squares within groups [Choose] The obtained F-value [Choose] The critical F-value [Choose] What should the researcher conclude? Values of the r correlation coefficient fall between -1.0 to 1.0. How many research hypotheses are used in a 2 x 2 factorial ANOVA? c. a Select one: a. indirect correlation positive correlation negative correlation univariate correlation Question 15 1 pts Which of the following values represents the weakest correlation? When you want to examine the impact of more than one independent variable on the outcome variable, what type of ANOVA should be used? What are the three null hypotheses used in a 2 x 2 factorial analysis? Select one: The following table lists many common symbols, together with their name, how they should be read out loud, and the related field of mathematics.Additionally, the subsequent columns contains an informal explanation, a short example, the Unicode location, the name for use in HTML documents, and the LaTeX symbol. d. All main effects, any interaction effect, What is another name for a regression line? b. 2. 126 terms. If the group has 30 individuals, what are the degrees of freedom for a dependent-samples t-test? d. internal consistency. 35% Will Mary need to use the services of a freight forwarder? b. A type of regression in which more than on independent variable is included in the analysis. c. .60 483,900,000 miles. 15. b. When conducting a chi-square test, the categories of your variable(s) must be _______. In the equation r(65) = .45, p < .05, what does r represent? Give an example of a situation when it would be appropriate to use the t-test for the correlation coefficient test statistic. If b = .90, the correlation between X and Y is, 23. e. If the person is answering the questions truthfully. c. On April 9, Dawson paid for the purchase made on April 1. d. On April 25, Dawson paid for the merchandise purchased on April 2. c. Predictor variable Known value of X \hline Stats Exam 3 pt 2. month, Dawson engaged in the following transactions: a. d. Criterion variable, If you are trying to predict Y scores from X scores, X is referred to as the __________. b. size of the population Positive correlation How many groups were included in your analysis? In the result _((5))^2=9.4,p< .05, what is 9.4? RESEARCH HUB - International Multidisciplinary Research Journal Volume-1, Issue-3, October 2014 The statement is wrong rxy = 0 does not mean that x and y are independent. What is test statistic known as? c. .45 Regression coefficient is a statistical measure of the average functional relationship between two or more variables. In order to establish concurrent validity, a type of criterion validity (from chapter 6), what would she do with the two sets of personality measurement tools? Is there a difference betweenmain effect forthe levels of the first factor? a. The t-test for independent means is used when each group is tested _______. Two-tailed. Linear regression uses correlations as its basis. An example of a research hypothesis for a one-tailed t-test for the correlation coefficient would be that there will be a positive correlation between number of hours studied and grade on a test. b. a. Nominal variable a. X' = aY + b The first example is creating a fully-formed C++ std::string object. Repeat requirement 1 assuming that the fair value of Centerpoint is $\$ 270$ million. In the development of a measurement tool that examines stable personality characteristics, a researcher would have participants in a study take the tool once in May and once in July. Select one: What does it indicate if r = -1.00? For each additional square kilometer of forested area added, the IBI will increase by 0.574 units. a. Ranges for IPv4 is from 0.0.0.0 to 255.255.255.255 where as IPv6 have 2^128 addresses. Share. d. 74%, If a simple Pearson correlation value = .685, what percentage of variance is accounted for? 25% Is r2=0.3 (r=0.9): 30% of variability in peoples weight can be Related to their height 70% of the difference between people in their of weight Is Independent of their height Remember: This does not mean that weight is partially Caused by height Arm and leg length have a high coefficient of Determination but a growing leg does not cause The correlation between variable X and variable Y is represented by which of the following? 44% The initial investment is the same for both businesses, and money is worth 10%10 \%10% compounded continuously. Select one: 2) What type of association does the correlation coefficient, ryx, quantify?
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