Why does adding a pre-test improve the internal validity of a post-test only nonequivalent control group design and make this non-experiment become a quasi-experiment? (/1)To explain your answer use this scenario: You want to determine if grade 3 EQAO scores differ in students that receive a special mathprogram vs. the typical math curriculum. In what ways can adding a pre-test control for assignment bias (/1)Maximum number of characters (including HTML tags added by text editor): 32,000Show Rich-Text Editor (and character count)7820MAR6étv4吕O F3888) F1ZF10FIIF7FBF9F2F4F5%23$%&5789%3DERYP

Given A pretest-posttest non equivalent control group design controls some for group differences by…

Answered: Why does adding a pre-test improve the…

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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A researcher wanted to examine whether type of dog food (freeze dried meat vs generic brand kibble) would affect dogs’ attention span. The researcher hypothesized that dogs who ate freeze dried meat would have longer attention spans than those who ate generic brand kibble. The researcher used a single sample of 13 subjects, that took part in both treatment conditions. Should the researcher use a one-tailed or two-tailed test? one-tailed two-tailed
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?
Classify the cases/scenario as regards to the appropriate design/analysis for the experiments: A woman learned from a friend that rubbing the leaves with either egg white or coconut oil could enhance the appearance of indoor plants. But she was doubtful that this will induce withering of the leaves. She then plans to conduct an experiment to compare the effects of these two. For better comparison, she would like to include a control (no egg whole nor coconut oil) and the outcome data follows a non-normal distribution. * (Parametric/Nonparametric – Design/Analysis e.g. Par-ANOVA(RCBD), Nonpar-Wilcoxon test) Your answer
Bias in Clinical Trials? Researchers investigated the issue of race and equality of access to clinical trials. The table below shows the population distribution and the numbers of participants in clinical trials involving lung cancer (based on data from "Participation in Cancer Clinical Trials," by Murthy, Krumholz, and Gross, Journal of the American Medical Association, Vol. 291, No. 22). Use a 0.01 significance level to test the claim that the distribution of clinical trial participants fits well with the population distribution. Race/ethnicity Distribution of Population Number in Lung Cancer Clinical Trials a) Test Statistic: b) Critical X²: c) P-Value: d) Conclusion: There Participation in Cancer Clinical Trials White non- hispanic 75.6% 3855 Hispanic Black 9.1% 60 sufficient evidence to support the claim. 10.8% 316 Asian/Pacific Islander 3.8% 54 American Indian/Alaskan Native 0.7% 12
Researchers were interested in assessing whether stress levels are different at the beginning of the semester compared to finals week. To test this, stress was measured in 5 students at the start of the semester and then again at the end of the semester during finals week. Participant Stress 1 Stress 2 Difference Score (Di) (Di - Mdiff)2 1 22 22 0 2 32 34 -2 3 24 25 -1 4 28 30 -2 5 26 29 -3 What is the observed test statistic (i.e., tobs)? Round to 2 decimal places.
what is the independent and dependent vairable in the sentence below? What are the learning styles of thestudents when group according to ageand sex?
A researcher notes that there seems to be a difference in the prevalence of high blood pressure among college-educated individuals who consume low amounts of processed foods and the prevalence of individuals who only have a high school education and consume high amounts of processed foods. Use the appropriate hypothesis to test for the independence of the two independent variables presented here at the 5% significance level to ensure confounding has not influenced the study’s results. Then, interpret your response. Diet Low in Processed Foods Normal BP High BP Total College Education 124 55 179 High School Education 69 152 221 Total 193 207 400 Diet High in Processed Foods Normal BP High BP Total College Education 64 85 149 High School Education 98 153 251 Total 162 238 400 The chi square value of 37.724 is higher than the chi square value of 3.84; therefore, we can accept H0 at…
Is this p-value significant at the 10% significance level? Is it significant at the 5% significance level? Compare the answers to these questions to your answers to parts (g) and (i) in two complete sentences.
On a trial basis, State College admitted 300 students from the lowest third of their high school graduation class. They were randomly divided into 3 groups. Group A received extensive training in study habits Group B received motivational lectures; and Group C received no special treatment. At the end of the year, the average grades of the groups were compared. Identify the following: * What is the Independent variable? * What is the Dependent variable? * Who is in the Experimental Group? * Who is in the Control Group? * What are at least 2 potential extraneous variables?

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