Dr. Rivera believes that mood disorder is less prevalent among older adults than it is among young adults. What is the correct null hypothesis?

Q: Spencer would like to study how gender and PTSD in veterans impacts risk for dementia. In order to…

A: Here the variables which are being manipulated are Gender and PTSD , while the variable which is…

Q: What happens to the power of a hypothesis test if the sample size is increased without changing the…

A: For a fixed significance level, increasing the sample size increase the power of a hypothesis test.…

Q: A researcher wants to test whether the average cholesterol level among those who regularly eat…

A: Introduction: Denote μ as the true average cholesterol level of those who eat frozen hot dogs…

Q: Briefly explain when a one-way ANOVA procedure is used to make a test of hypothesis?

A: One-Way ANOVA is used to compares the means of two or more independent groups in order to determine…

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

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

Q: Is it possible to determine causation from a quasi-experiment? How and why does the interpretation…

A: Introduction: Causation: The cause-and-effect occurs between two groups if the one group makes the…

Q: How can human bias influence data used to test hypothesis?

A: We have to write How can human bias influence data used to test hypothesis.

Q: A researcher wanted to know if there is an association between exercise and sleep for the population…

A:

Q: Researchers are trying to determine if the prevalence of CVD is different in smokers compared to…

A: Here compare provenance of CVD BETWEEN non smoker and smokers

Q: A psychologist is looking at the relationship between personality characteristics and physical…

A: Given :   Heart disease No Heart disease Total Type A 32 18 50 Type B 128 22 150 Total 160…

Q: Briefly explain when a one-way ANOVA procedure is used to make a test of hypothesis 8. What is the…

A: (a) The one-way analysis of variance (ANOVA) is used to determine whether there are any…

Q: 20. In statistical notion, what is your null hypothesis?

A: Given that  Sample size n =7 The null hypothesis H0.

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

A:

Q: What does rejecting the null hypothesis and statistically significant both signify?

A: The key assumption of a hypotheses test is that the null hypothesis is true. The aim of the…

Q: What is the observed significance level for this test?

A: here given , n= 50  sample mean  =  19.4  sample standard deviation  =  3.1

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: how can statistical procedures can help determine whether the data is attributable to chance…

A: Statistical approaches can be quite useful in identifying whether or not data is due to chance. To…

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: Interpret, in words, what it means for a research question that a null hypothesis was accepted.

A:

Q: whats an experimental hypothesis?

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

Q: What are two reasons that some people in the field believe significance testing should be banned?…

A: Here we want to discuss reasons that some people in the field believe significance testing should be…

Q: whats a statistical hypothesis?

A: Hypothesis: Hypothesis is an assumption about the parameter of the population which will be made on…

Q: Will the null hypothesis be rejected at a 5% level of significance?

A: Here sample proportion p⏜ = 0.63 Sample size n = 800 Now testing given hypothesis

Q: Discuss all possible factors that would affect the validity of test scores

A: A test score is the value of the test statistic when the values of the parameter are put.

Q: How can they tell that this is a two-tailed test?

A: From the given information we find the solution.

Q: Show the difference between two approaches to significance testing?

A: The two approaches to significance testing are p-value approach and critical value approach.

Q: What happens to the power of a hypothesis test if the significance level is decreased without…

A: Solution: It is required to mention what happens to the power of a hypothesis test if the…

Q: What does it mean to say that there is a 15% chance of a Type II error?

A: A Type II error occurs when we fail to reject H0 (null hypothesis) when, in fact , H0 is False.…

Q: Explain the analysis plan that describes how to use sample data to accept or reject the null…

A: Step 2 Formulate an Analysis Plan: Describe the tests that will be appropriate to use to check…

Q: A psychological study wants to analyze the relationship between anxiety and binge drinking; a…

A: Chi-square independence test: The chi-square is a non-parametric test which is used for comparing…

Q: what causes the rejection of null hypothesis? what is the significance level?

A: The p - value less than 0.05(5%)

Q: Researchers have observed that high school students who watched educational television programs as…

A: Observational study:If the individuals under the study are just observed and measured based on…

Q: What is the difference between experiment and testing?

A: Let EXP denote experimenting. Let TES denote testing.

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: How to create a good research hypothesis?

A: *Answer :    There are several criteria that make a research hypothesis a good one, and following…

Q: What is the normal hypothesis and alternative hypothesis?

A: In probability and statistics, the null hypothesis is a comprehensive statement or default status…

Q: A research company wants to determine whether there is a difference in effectiveness of a brand-…

A:

Q: Colorblind Although some women are colorblind, thiscondition is found primarily in men. Why is it…

A: Correlation measures the strength of linear association between the variables. However, it suffers…

Q: Explain the threats to External Validity of quasi-experiment?

A:

Q: A researcher gathered a sample of participants who volunteered for a studying of phobias. She…

A: A researcher gathered a sample of participants who volunteered for a studying of phobias. She…

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: The mean age of bus drivers in Chicago is 50.6 years. If a hypothesis test is performed, how should…

A: H0: μ =50.6

Q: What are six differences between the null hypothesis and the research hypothesis?

A: In a hypothesis to test any claim made null hypothesis and the research hypothesis are formed and…

Q: Why are post hoc tests performed?

A: Analysis of variance test is used to analyse the significant difference among the group means in the…

Q: The mean age of bus drivers in chicago is 56.7 years. If a hypothesis test is performed, how should…

A: Denote μ as the population mean age of bus drivers.

Q: What is the primary weakness of sensitivityanalysis? What is its primary usefulness?

A: Weaknesses of sensitivity analysis It assumes that changes to variables can be made independently,…