The effect of the time of day a psychology class is taught on test scores is being studied in an experiment. Student ability has been identified as an extraneous factor that could also affect test scores. How can student ability best be addressed to minimize its effect in the experiment?- **A.** Direct control of what textbook is used- **B.** Randomization of students in morning and afternoon classes- **C.** Replication of the experiment at different times of the year- **D.** Blocking into groups based on the teacher of the class

We have to answer question based on design of experiment.

Answered: The effect of the time of day a…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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which of the following are correct? I. One purpose of a double-blind study is to control for researcher bias and placebo effect. II. The main purpose of randomizing individuals to treatment groups is to control for bias. III. Replication is used to help reduce chance variation in experiments.
A certain HMO is attempting to show the benefits of managed care to an insurance company. The HMO believes that certain types of doctors are more cost-effective than others. One theory is that certification level is an important factor in measuring the cost-effectiveness of physicians. To investigate this, the HMO obtained independent random samples of 27 physicians from each of the three certification levels-Board certified (C): Uncertified, board eligible (E); and Uncertified, board ineligible (1)- and recorded the total per member per month charges for each (a total of 81 physicians). How many factors are present in this study? 0000 81 27 3 01
A recent headline reads “Early Language Skills Reduce Preschool Tantrums, Study Finds", and the article offers a potential explanation for this: “Verbalizing their frustrations may help little ones cope.” The article refers to a study that recorded the language skill level and the number of tantrums of a sample of preschoolers. Is this an observational study or a randomized experiment? Can we conclude that “Early Language Skills Reduce Preschool Tantrums”? Why or why not? Give a potential confounding variable.
True or False: Suppose I conducted a study using random assignment. This suggests that I took great effort to ensure that all of my subjects had an equal chance of being in either group.
When neither the subject nor those having contact with the subject know the treatment assignment, the study is called unbiased. double-blind. blind. statistically significant. randomized.
determine the degrees of freedom if necessary
This data set contains the achievement test (English as a Second Language) results and some background data collected during experimental trial of a new ESL program. The study was one year in duration. Students were allocated to the experimental ESL program class and a regular program control class on a random basis. Vocabulary and grammar tests were administered to the students in both groups at the beginning and the end of the school year. Variables The dataset includes 24 cases and 7 variables: Student ID Group (1 - experimental, 2 - control, 9 - missing) Gender (1 - male, 2 - female, 9 - missing) Pre-test vocabulary scores (scores range from 0 - 25, 99 - missing) Pre-test grammar scores (scores range from 0 - 25, 99 - missing) Post-test vocabulary scores (scores range from 0 - 25, 99 - missing) Post-test grammar scores (scores range from 0 - 25, 99 - missing) (a) develop a research question that can be addressed with independent-samples t test (b) state the null and alternative…
Q1: Placebo effect of exercise In a high-profile research study, Crum and Langer (2007) performed an experiment to test whether the relationship between physical exercise and health is impacted by one's mindset: in other words, if there is any "placebo effect" of exercise. A sample of 84 randomly selected hotel workers in the United States were placed either into a treatment group (n=44) or control group (n=40) depending on which hotel they worked at. The treatment group was given information demonstrating how their work is good physical exercise, while the control group was not given this information. They measured the body mass index (BMI) for each worker before the experiment and again four weeks after the experiment. a. Are the treatment group and control group independent of each other, and if so why? b. Now consider the treatment group alone: are the measurements of BMI taken before and after the experiment independent of each other, and if so why? c. What is the most appropriate…
How many subjects in the "patch only" group would you expect not to quit
A researcher uncovers that there is a significant interaction between the factor of marital status (i.e., married or non-married) and participant sex (i.e., male or female) regarding well-being among a sample with n = 4 participants in each condition. What would be the degrees of freedom for the simple main effect examining the difference in well-being between married men and women? a. df = 2, 12 b. df = 1, 14 c. df = 2, 14 d. df = 1, 12
5. Use the data set 1. This is the result of a randomized trial in Uganda where 10 students in the same village were selected and given a solar-powered reading lamp. The second group was not given any lamp. The number of students out of 10 who improved their school grades for both groups were recorded. The experiment was repeated in 50 villages. Test the hypothesis that solar-powered reading lamps are effective in improving school grades in Uganda.
State the hypotheses for each of the three separate tests included in the two-factor ANOVA.

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