8. Using multiple regression, researchers found that greater levels of sibling aggression predictedworse mental health in children, even when controlling for the parents' education level and thechild's age, gender, and ethnicity. Can the researchers conclude that sibling aggression causesworse mental health?a. Yes, because covariance, temporal precedence, and internal validity have all been established.b. No, because other variables not measured by the researchers could explain the relationshipbetween sibling aggression and mental health.No, because temporal precedence has not necessarily been established.d. both (b) and (c)C.

From the given information, the research conducted multiple regression analysis using the variables…

Answered: 8. Using multiple regression,…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question 5 Consider a two way-factorial ANOVA with two factors: homework and test anxiety. Homework has two categories (prepared homework vs. did not prepare) and so has test anxiety (test anxiety vs. no text anxiety). Homework and test anxiety are used to predict the continuous outcome variable test score. The statistical model includes significant main effects and a significant interaction effect. Indicate for each of the statements whether it is correct. Correct Incorrect The difference in test scores between pupils with and without test anxiety differs between those who prepared their homework and those who did not. The effect of having prepared homework on test scores differs across pupils who have test anxiety and pupils who do not have test anxiety.
3 see picture
What is the turkey HSD for week 0 to week 2 comparison?
The relationship between the independent variable (IV) and the dependent variable (DV) is likely to be mediated by a third variable (MV). With regard to the statement above, which of the following is most likely to be correct? A IV = Students’ performance (i.e., marks) in the formative assessment; DV = Students’ performance (i.e., marks) in the summative assessment, and MV = Students’ level of comfort with the venue of the assessments B IV = Students’ performance (i.e., marks) in the summative assessment; DV = Students’ performance (i.e., marks) in the formative assessment, and MV = Students’ level of preparation for the assessments. C IV = Students’ performance (i.e., marks) in the formative assessment; DV = Students’ performance (i.e., marks) in the summative assessment, and MV = Students’ level of preparation for the assessments D IV = Students’ performance (i.e., marks) in the summative assessment; DV = Students’ performance (i.e., marks) in the formative assessment,…
In this same passage, is it explanatory variable or response variable?
A researcher wants to test a new memory performance supplement that has shown some promise in primate studies where subjects were given the supplement followed by the task of identifying pictures of other animals three days later. The dependent variable was measured by the number of pictures correctly identified. The researchers noticed that while there was a positive correlation between the group given the supplement and number of correctly identified pictures as compared to the control group, they also notice that there seemed to be some variation between the males and females of the primates. Additionally, two different amounts of the drug have been proposed for consideration. Therefore, in the current study, the researchers want to divide the subject primates (N=60) by gender (male: n=30; female: n=30), and give them a 10 mg dose in one treatment condition, and a 25 mg dose in the other treatment condition. To do this, they are dividing each group of males and females in half, and…
Scenario: If 20 participants completed an attention task twice — once after consuming a sugar pill and once after consuming a pill that contained 25 mg nicotine, which test would be most appropriate? Assume data meets all assumptions for a parametric test, and that participant exposure to the sugar pill vs. nicotine pill were counterbalanced. Question: What is the research / alternate hypothesis for this scenario? Nicotine does not affect attention. Nicotine affects attention. Anxiety does not affect attention. Anxiety affects attention.
A. Write the hypothesis and null you believe the researcher is testing. B. Make a claim about this hypothesis test; noting form, degree, and significance in yourclaim. C. Make a claim about the overall fit of the model (significance, variance explained). D. Discuss a plausible potential control variable you would want to include and the impact that you would speculate it to have on this relationship. (For example, what type of control is your variable, how will it alter the relationship between the DV and the IV, etc.).
Researchers have conducted a study to investigate the mathematical competency of primary school students from three different countries: Australia, Canada and America. It was hypothesised that mathematical competency would be highest for Canadian students, followed by Australian students, then American students. It was also hypothesised that the child's sex would moderate this relationship. Here, mathematical competency is measured on a continuous scale, with higher scores representing higher levels of competency. Which of the following would be an appropriate statistical test to conduct, which addresses these hypotheses? Group of answer choices: Mixed ANOVA Within subjects ANOVA Factorial ANOVA Multiple Regression Single Factor ANOVA
Researchers investigate how the presence of cell phones influence the quality of human interaction. Subjects are randomly selected from a population and divided into an experimental group that is asked to leave their phones in the front of the room and a control group that are not asked to leave their cell phones at the front of the room. Subjects are left alone for 10 minutes and then asked to take a survey designed to measure quality of interactions they had with others in the experiment. What statistical test is appropriate?
When results are not statistically significant, why do you conclude that it is plausible that the two variables are independent rather than concluding that the variables are different independent?
A significant interaction was found between depression, social support and GPA. These results should be considered with caution and further research should be done to better understand the relationships between these variables. Furthermore, those working with college students should consider the overall well-being of the student, as it is possible that their academic performance may not be affected by anxiety and/or depression. IS THIS A TYPE 1 ERROR OR A TYPE 2 ERROR IN RESEARCH?

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