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Tell when to use a Pearson’s correlation, the possible research hypotheses for this statistical model, and when correlation can be used to test each type of Research Hypothesis (attributive, associative and causal).

1. A Pearson's correlation is used when you want to find a linear relationship between two variables. It can be used in a causal as well as a associativeresearch hypothesis but it can't be used with a attributive RH because it is univariate.

2. Pearson's correlation should be used only when there is a linear relationship between variables. It can be a positive or negative relationship, as long as it is significant. Correlation is used for testing in Within Groups studies. A possible research hypothesis for this statistical model would be that there is a positive linear relationship between variables. Another possible research hypothesis would be that there is a negative linear relationship. If there is no linear relationship between the variables, then we would retain the null hypothesis.

3. Pearson's correlation should be used when there is a significant effect. (p > .05) When there is a relationship between two variables. There can be a positive or negative correlation. It cannot be used when we retain the null hypothesis because then there is no relationship. It can be used if the null is rejected.

4. A Pearson's correlation is used when two quantitative variables are being tested in the RH. This cannot test attributive RH, but can associative and causal. The associative hypothesis can be tested when ever we want with a correlation. The causal RH can only be used with a correlation when a well-ran true experiment is being ran.

5. You use a Pearson's correlation when you believe there is a linear relationship in your data. With a correlation, you can hypothesize that you will have a positive linear relationship (ex. as __ increases, so will __), a negative linear relationship (ex. as __increases, __ will decrease), or a nonlinear relationship in which the data is not related. You normally only use a Pearson's correlation if you believe there is a linear relationship.

6. Use a Pearson's correlation to determine if a signicant linear relationship exists in a bivariate association. The three possible research hypotheses for this model are: positive linear relationship, negative linear relationship, and no linear relationship (H0:). Correlations may be used to test two quantitative variables. Correlations can be used to predict relationships in longitudinal studies or to identify relationships between variables.

7. Pearson's correlation is used when we have two quantitative variables and the research hypothesis predicts whether there is a linear relationship between these two quantitative variables. There are two ways we can express the research hypothesis 1.) researcher can say that they expect to have a correlation that is positive, negative or zero. 2.) we can also express this as a scatterplot. When testing a correlation it can never be tested using attributive hypothesis because attributive hypothesis looks at the discrimination of a single variable and is univariate where a correlation is a bivariate variable. You can test a correlation using an associative hypothesis anytime you want no matter what design is used. You can only test correlation with a causal research hypothesis when it is a true experiment, random assignment of individuals, researcher manipulated the IV and there are no confounds.

8. Use Pearson's correlation model when you are comparing two quantitative variables in which the results can be seen by using a linear model/graph. A possible research hypothesis for a Pearson's correlation is as follows: It is hypothesized that as the number of hours spent studying will increase the final exam scores. The hypothesis used in the example would be a causal experiment where you would use Pearson's correlation model.

9. You use Pearson's correlation when you want to predict and find a linear relationship between two variables. You would use correlation when dealing with two variables that are quantitative. Therefore, if your research hypothesis contained two variables in which you wanted to find the linear relationship between (positive or negative) than you would use Pearson's Correlation. I will state an example using the variables age and GPA. Age and GPA are both quantitative variables I wish to measure. I hypothesize that age and GPA will have a positive linear correlation

10. Pearson's correlation will be used when there are two quantitative variables. It will also be used when the research hypothesis identifies a linear bivariate relationship. Pearsons correlation can have the following Research hypotheses, a positive linear relationship, a negative linear relationship, or no linear relationship (also known as HO:). Correlation can be used in a causal research hypothesis if the study is a true experiment. Correlation can also be used in an associative hypothesis becuase Pearsons r is bivariate. Correlation cannot be used in an attributive hypothesis.

11. Pearson's correlation is used when you are working with two quantitative variables in a population. The possible research hypotheses are that the variables will show a positive linear relationship, a negative linear relationship, or no linear relationship at all. Correlation cannot be used to test an attributive research hypothesis, but if it is a true experiment, it can be used to test a casual hypothesis. Correlation can always be used to test an associative hypothesis.

12. Pearson's correlation would be used when there is 2 quantitative variables. There must also be a linear relationship between the variables. There are 3 possible research hypotheses which would include a positive correlation (+r), a negative correlation (-r), or no correlation (r=0). Correlation could be used to test an associative hypothesis at any time. Correlation could also be used to test a causal hypothesis but only if the design is a true experiment (RA, manipulation, no confounds, lab study, short-term). Correlation could never be used to test an attributive hypothesis.

13. The ANOVA is used when there is either a within groups (wg ANOVA) or a between groups (bg ANOVA) that is looking for a realtionship in the mean differences of variables. The possible research hypotheses used are based on a greater than, less than, or equal too comparison. ANOVA can be used in all associative situations, and causal situations if it is a true experiment with manipulation of the IV.

14. We use a Pearson's correlation when we are testing two qualitative variables. The possible research hypotheses are that r has a positive linear relationship, that r has a negative linear relationship, or that r has no linear relationship (r=0). Correlation can not be used at all for an attributive test because attributive is an univariate test and a correlation tests for bivariate variables. You can use a correlation for any associative hypothesis at anytime. You can also use correlation for a causal hypothesis as long as the experiment is a true experiment, that is that there is random assignment, there is manipulation of the IV and that there are no confounds in the study.

15. A Pearson's correlation is used when there are two quantitative variables. The possible research hypotheses are that there is a postive linear relationship between the variables, a negative linear relationship between the variables, or no linear relationship between the variables. Correlation can be used to test research hypotheses when there is a linear relationship between the two variables.

16. Pearson's correlation is utilized when you have two quantitative variables and you wish to see if there is a linear relationship between those variables. Your research hypothesis would represent that by stating that one score affects the other in a certain way. The correlation is affected by the size and sign of the r. A small size makes for a small effect. A postive correlation results in a postive linear relationship where as a negative r results in a negate linear relationship. This statistic should only be utilized after consulting a scatterplot and seeing there is a possibility of having a linear relationship. This bivariate statistic cannot be utilized for attribution hypothesis because it involves the interaction of two variables, not the distinction of a single variable. Associative hypothesis can be tested at all times because they can be nonexperiments or true experiments. Causal hypothesis can only use correlational data if the hypothesis is a randomally assigned true experiment.

17. You use Pearson's correlation when you're dealing with two quantitative variables. The three possible research hypotheses state whether or not there is a linear relationship between the two variables. 1) +r: There is a positive linear relationship (as one variable increases, so does the other). 2)-r: There is a negative linear relationship (as one variable increases, the other decreases). 3)r=0 : there is no linear relationship between the two variables (which is the same as the null hypothesis) Attributive RHs deal with univariate statistics, and correlation is a bivariate statistical model, so you can never use correlation to test an attributive RH. For associative RHs, you can use correlation anytime with any research design. With causal RHs, you can only use correlation if you have a true experiment. And to have a true experiment, you need random assignment of individuals, manipulation of the IV, and no confounds.

18. A Pearson's correlation is used when the two statistics we want to analyze are both quantitative. This means we will be comparing quantitative variables to find a linear relationship (if the variables represent a nonlinear relationship, a correlation is not appropriate). The possible research hypothesis for a correlation are that the variables are positively correlated (as one variable gets larger so does the other), negatively corelated (as one variable gets larger the other gets smaller), or not correlated (the null hypothesis, that there is no realtionship between the two variables) (+,-,0). Pearson's correlation may never be used to test an attributive research hypothesis because an attributive research hypothesis only includes one variable. Pearson's r is a bivariate statistical model that analyzes two variables. Pearson's correlation may ALWAYS be used to test an associative research hypothesis as long as the variables being analyzed are both quantitative. Pearson's corrleation may only be used to test a causal research hypothesis when the research design is a true experiment (when there is random assignment of individuals by the researcher before manipulation of the IV, manipulation of the IV, and no confounds).

19. Pearson's correlation is used when you want to see if their is a linear relationship between two quantitative variables. The research hypothesis is just that, expecting to find a linear relationship between those variables. Correlation cannot be used with attributive RH's, it can be used anytime with an associative RH, and only when it is a true experiment, with random assignment can a corelation be used with causal RH's.

20. When making decisions on what staistical model to use we have to look at the Research Hypothesis design not the statitic model. In order to use Pearson's correlation two things have to be satisfied. The first, variables have to be both quatitative and the second is that the Research Hypothesis must be about linear relationships. There are three possible Research Hypothesis for this statistical model and they are: 1. There is a positive linear relationship. 2. There is a negative linear realtionship. 3. There is no linear relationship between the two variables. A correlation can also be shown in a scatter plot which would be is to hard to show on this computer. Correlation can never be used to test for a an attrbutive hypothesis because it is univariate and since you only have one variable you can't compare it to anything. Correlation can always be used with an associtaive hypothesis. Correlation can only be used in causal hypothesis if it is a true experiment. You must have random assignment of the individuals, manipulation of the IV, and no confounds.

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