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?
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?
Using the latest in medical technology, an orthopedic doctor has developed a new surgical procedure that he believes is an improvement over the standard procedure. He wants to study whether the mean recovery time of patients who have the new procedure is less than the mean recovery time of patients who have the standard procedure. The doctor studies a random sample of 11 patients who have the new procedure and a random sample of 9 patients who have the standard procedure. (These samples are chosen independently.) The doctor records each patient's recovery time (in days). The patients who had the new procedure have a sample mean recovery time of 367.3 with a sample variance of 2851.8. The patients who had the standard procedure have a sample mean recovery time of 420.9 with a sample variance of 98.1. Assume that the two populations of recovery times are approximately normally distributed. Can the doctor conclude, at the 0.01 level of significance, that the population mean of the…
A school psychologist is interested in whether or not teachers affect the anxiety scores among students taking the Statistics exam. The data below are the standardized anxiety test scores for students with the three different teachers. Teacher’s Name Ms. San Pedro Ms. San Juan Ms. San Jose 8 23 22 10 14 18 12 12 14 11 8 22 13 15 22 15 16 10 16 14 11 17 19 9 9 10 10 13 Perform an analysis of variance at the 0.05 level of significance.
When two independent variables produce effects when combined that would not be present if each independent variables was manipulated in a separate study, we say that there is O no main effect. O only a measured variable an interaction. O a planned comparison. rist and Stangor (2001) studied prejudice and found that you can't predict a person's behavior toward minorities on the basis of whether they are high or low

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