In a one-factor random-effects model, suppose we find that the effect of factor A is significant at α = .05.
Which of the following is our best option?
a. We should conduct MCP on A.
b. We should conduct MCP only when A has more than two levels.
c. We conclude that not all the μ.j. are equal at significance level .05.
d. We are sure that the effect of A will also be significant if we have applied a fixed-effects model to the data.
d. We are sure that the effect of A will also be significant if we have applied a fixed-effects model to the data.
In a one-factor random-effects model, suppose we find that the effect of factor A is significant...
Complete the following ANOVA summary table for a model, where there are three levels of factor A selected by the researcher and two levels of factor B selected at random. Each cell of the design includes 40 students (α = .05). In statistical language (symbols) what are the most appropriate null and alternative hypothesis for each factor (effect) for the model? SS DF MS F Critical Value Decision A 2000 B 1000 AB 3000 Within 1755 Total 7755
Dr. Bellus wants to study how people's perception of attractiveness is affected by the gender of the subjects, and the facial expression of the object. Each participant views six headshots (in random order) of the same person, who demonstrates different facial expressions (joy, surprise, fear, anger, sadness, and disgust) in each picture. The participants are then asked to rate the attractiveness level of each picture. The rating is the dependent variable. Below is the selected output of a two-factor split...
Dr. Bellus wants to study how people's perception of attractiveness is affected by the gender of the subjects, and the facial expression of the object. Each participant views six headshots (in random order) of the same person, who demonstrates different facial expressions (joy, surprise, fear, anger, sadness, and disgust) in each picture. The participants are then asked to rate the attractiveness level of each picture. The rating is the dependent variable. Below is the selected output of a two-factor split...
Suppose we want to assess the effect of a one-day SAT prep class at a 5% level of significance. Scores on the SAT writing exam can range from 200 to 800. A random sample of 50 students takes the SAT writing test before and after a prep class. We test the hypotheses: LaTeX: H_0 H 0 : LaTeX: \mu=0 μ = 0 LaTeX: H_a H a : LaTeX: \mu>0 μ > 0 where LaTeX: \mu μ is the mean of...
Scenario Three: A group of parents believes that the proportion of students who find their college experience extremely rewarding does not equal 50%. They decide to test this hypothesis using a significance level of .05. They conduct a random sample of 100 students and 34 say they find their college experience extremely rewarding. You only need to redo the steps below to receive full credit for scenario three. Based on the type of test this is (right, left, or two-tailed);...
When consumers apply for credit, their credit is rated using FICO scores. A random sample of credits ratings is obtained, and the FICO scores are summarized with these statistics: n = 18, x ̅=660.3, s = 75.9. Use a 0.05 significance level to test the claim that these credit ratings are from a population with a mean that is equal to 700. 1. Copy and paste the Minitab output for exercise into the document underneath the problem. You are not also...
Aa Aa 11. Two-factor ANOVA Emphasis on calculations W.Thomas Boyce, a professor and pediatrician at the University of British Columbia, Vancouver, has studied interactions between individual differences in physiology and differences in experience in determining health and well-being. Dr. Boyce found that some children are more sensitive to their environments. They do exceptionally wel when the environment is suppo「tive but are much more likely to have mental and physical health problems when the environment has challenges. You decide to do...
11. Effect size and Cohen's d Aa Aa Suppose a researcher is trying to understand whether people who purchase fast-food hamburgers would be willing to pay more if the hamburger comes with a free cookie. Prior research suggests the mean amount customers say they are willing to pay for a hamburger is -4.14 and ơ-1.40 The researcher plans to conduct a study very similar to the prior research by selecting a sample of customers and asking them how much they...
D Question 6 5 pts What model would you use in a hypothesis test the difference between two means? O t O Chi square OF D l Question 7 5 pts Suppose a glass factor samples 2000 glasses. There are flaws in 75 of them. Find a 95% confidence interval for the true proportion of flaws. O (033,.041) O (0,.0375) O (0356.0393) O (029,.046) Question 8 If the estimated mean from sample is 10, then O is equivalent to the...
12. Measuring effect size for two-factor ANOVA It is projected that approximately 580,000 veterans will take advantage of the GI Bill for the 21st Century. Boots to Books is a course for all veterans, current military members, and their family members, friends, and supporters. The goal of Boots to Books is to assist deployed, postdeployed, and veteran students in making a positive transition from military to civilian life or from deployment to postdeployment life, including the acquisition of college survival...