Is this a valid experimental design?

Q: A researcher states an alternative hypothesis that the exercise improves physical health. Which is a…

A: Given information- We have given an alternative hypothesis that the exercise improves physical…

Q: . Test the null hypothesis of no treatment effect on the number of plant species.

A: d Significance test for correlation: H0: ρ=0                                    (Null Hypothesis)…

Q: Compute the x² value (test statistic) for this scenario.

A: here from given table complete the table with row total and column total    for Against Row…

Q: Define the term of Experimental Error ?

A:

Q: What are the assumptions for a paired difference experimental design?

A: In paired experimental design, each study unit contributes a pair of observations which implies…

Q: Define Various Threats to Internal Validity of quasi-experiments?

A: Quasi experimental research involves the manipulation of an independent variable without the…

Q: What condition on a data set is required to apply the empirical rule?

A: The condition that required to apply the empirical rule is that the shape of the data should be…

Q: What information is provided by calculations of the “t” test statistic?

A:

Q: The alternative hypothesis for an ANOVA states that

A: ANOVA: In one factor ANOVA model only one factor is studied, that is only the effect on one factor…

Q: What does it mean if the cases are not selected randomly but are assigned randomly to groups?

A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: Define OLS with Heterogeneous Causal Effects?

A:

Q: What is the difference between defining a research problem and developing a hypothesis?

A: The difference between defining a research problem and developing a hypothesis is given below:

Q: A researcher conducts an experiment comparing two treatment conditions and wants to have 30 scores…

A: Independent measure design: Data is selected from different and independent participants groups.…

Q: If a process in a factory is in a state of statistical control it means that it is unstable. True…

A: The given statement is "If a process in a factory is in a state of statistical control it means that…

Q: Can the empirical rule be used on any population, why or why not?

A: Empirical Rule tells us that approximately every bit of data will be falling within three standard…

Q: Explain why the null hypothesis should not be accepted when the effect is not significant?

A:

Q: Which term best describes the experimental design used in this study?

A: we need to identify suitable experiment method for the given situation .

Q: Explain the effect of effect size on power in relation with null hypothesis?

A: Power of a test: The probability that not occurring the type II error is called power of the test.…

Q: What significant element distinguishes a quasi-experiment from a true experiment?

A: Given problem Given that   What significant element distinguishes a quasi-experiment from a true…

Q: A researcher has a hypothesis that a specific drug may have a higher prevalence of side effects…

A: The hypothesis is that a drug may have a higher prevalence of side effects among members of the…

Q: whats an experimental hypothesis?

A: Hypotheses is the plural form for hypothesis. Hypothesis is a statement about the population…

Q: State the assumptions for one-way fixed effects model and the one-way random effects model.

A: Fixed Effects : It is assumed that 1)ε i ( j ) is normally and independently distributed with a mean…

Q: How do I find the first quartile?

A: Given values are, Population mean  μ=148 Population standard deviation  σ=45 Population size n=6 a)…

Q: The data collected in a research study well either support or refute the -that the study is designed…

A:

Q: In a designed experiment, what are the experimental units?

A: Design of experiments (DOE) is a systematic method to determine the relationship between factors…

Q: If a test statistic does not lie in the critical region, we should the null hypothesis.

A: Rejection Rule: IF the test statistic value lies within the critical region, then reject the null…

Q: The first quartile is

A: here use standard normal distribution table for z score for 0.25

Q: Explain how methods developed for analyzing randomized experiments can be applied to…

A: The methods developed for analyzing the randomized experiments can be applied to quasi-experiments…

Q: Are these data good evidence that on average the E. coli levels in these swimming areas were safe?…

A: Using r software: use mean function in R to get mean x sd function in R to get standard deviation…

Q: Are any of these results significant?

A: The ANOVA table for Intended Screen Time is given.

Q: One study of cell phones and the risk of brain cancer looked at a group of 469 people who have brain…

A: The study was done to know if the use of cell phones and the risk of brain cancer are associated…

Q: Explain the Instrument Exogeneity? Can we statistically test the assumption that the instruments are…

A:

Q: A t-test would reject the null hypothesis at a 0.05 significance level. True or False?

A: Note: Hey there! Thank you for the question. As you have specifically asked for the decision…

Q: What are Experimental errors?

A: Experimental errors: Experimental error is the difference between a measurement and the true value…

Q: What is a “quasi – experimental design” and how does it differ from an ex post facto design?

A: A quasi-experimental design aims to establish a cause-and-effect relationship between an independent…

Q: What is the empirical rule?

A: The word 'empirical' stands for 'based on observations.  The 68–95–99.7 rule, also known as the…

Q: When should the Empirical Rule be used?

A: Empirical rule provides percentages of observation that will lie within 1 SD, 2 SD and 3 SD.

Q: Explain the Different areas, where quasi-experiment research strategy has been applied?

A: Here's  the explanation is as follows; A quasi-experiment is simply defined as not a true…

Q: Explain how the average causal effect for a given population can be estimated by using an ideal…

A: Causal effect may be different for different individuals and it is not possible to measure the…

Q: Describe briefly the concepts of Completely Randomized Design (CRD) as they apply to agricultural…

A:

Q: What is another name for the empirical rule? Why is that name appropriate?

A:

Q: Why is the empirical rule useful?

A: The empirical rule, which states that nearly all data will fall within three standard deviations of…

Q: What are the various Potential Problems with Quasi-Experiments?

A:

Q: If the condition for using the empirical rule is met, why should that rule be used instead of…

A: The Chebyshev’s rule will estimate a minimal percentage, whereas the empirical rule gives almost the…

Q: Explain two reasons why the research hypothesis is not tested directly.

A: the null hypothesis is a neutral statement about a population parameter that is never proved or…

Q: Bonnie and her friends are dubious that a new abdominal exercise machine is as effective as its…

A: Given Data: Average for treatment group=33.4 Average for control group=39.8

Q: Explain the concept of Quasi-Experiments?

A:

Q: Judge and Cable (2010) found that thin women had higher incomes than heavier women. Is this an exam-…

A: Exp study involves manipulation of control variable. Non exp study doesn't involve manipulation of…

Q: I am testing whether a new group study technique improves PSYC 214 students’ final exam grades. In…

A: type 1 and type II error