In a typical experiment, the researcher manipulates the independent or explanatory variable and then observes whether the hypothesized dependent variable is affected by the intervention. Choose any two examples of experiments and describe the independent and dependent variables.

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: Explain the difference between the one-way fixed effects model and the one-way random effects model.

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Q: A researcher wants to see if gender and / or income affects the total amount of help given to a…

A: Ans: Step 1Given: The researcher wants to see if gender and / or income affect the amount of…

Q: In a similar study (to the previous scenario), researchers would like to compare the average anxiety…

A: Given : Three different age groups 18 to 29 30 to 39 40 to 49

Q: The article "Americans are 'Getting the Wrong Idea' on Alcohol and Health"† reported that…

A: The correct options are Someone who is more active is more likely to seek out healthier food.…

Q: A criminologist studied fear of crime, age, and gender of people who were present for Hurricane…

A: Dependent variable:The dependent variable is the quantity under study based on a number of factors,…

Q: Seattle Grace Medical Center. As part of a long-term study of individuals 65 years of age or older,…

A: “Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: In a study on attitudes toward the blacks, participants are asked questions such as, “Do you believe…

A: In a study on attitudes toward the blacks, participants are asked questions such as, “Do you believe…

Q: When conducting a significance test for correlation, if your null and alternative hypothesis are:…

A: Test is that whether or not the correlation is significant.

Q: What distinguishes a quasi-experiment from a true experiment? When might a quasi-experiment be more…

A: The difference is that the criterion for assignment is selected by the researcher in 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: A researcher would like to evaluate the claim that drinking large quantities of water can help…

A: Correlational study:  A correlational study is an one type of study where researcher observes the…

Q: Cite three examples of two variables that are positively correlated and three bivariate data that…

A: Correlation means the relationship between two variables. There are 4 types of correlation.…

Q: A group of 60 volunteers who do not regularly exercise are randomly assigned to one of two fitness…

A: Observational study: In this case, the individuals of the study are observed by the researcher. The…

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: A within-groups experiment differs from a between-groups experiment because:     The IV is split…

A: Introduction: In designed experiments, within-groups experiment and between-groups experiment are…

Q: A researcher wants to find if there are associations between heart diseases and several variables.…

A: Association between the variables can be established if both the variables are categorical.…

Q: In Clinical Trial Q, the sample of patients who had acute myelomonocytic leukemia, per statistical…

A: Type I error: The type I error if the null hypothesis is rejected when it is actually true. Type II…

Q: Researcher asked waitresses to wear different colored T-shirts on different days for a six-week…

A: Independent variables- Independent variable is the variable the experimenter changes or controls to…

Q: Suppose that you have bivariate data for a sample of a population. a. How would you decide whether…

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Q: In a typical experiment the researcher manipulates the independent or explanatory variable and then…

A: Example 1 ) We want to assess whether a new learning method is helping the Male and Female students…

Q: In a study reported in the American Journal of Clinical Nutrition, young men who drank fat-free milk…

A: Given, In a study reported in the American Journal of Clinical Nutrition, young men who drank…

Q: A sports psychologist was interested in the effects of a six-week imagery intervention on an…

A: Given : A sports psychologist was interested in the effects of a six-week imagery intervention on an…

Q: A recent study randomly selected women from various countries around the world and collected…

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Q: Compared to observational studies like cohort and case-control studies, experimental studies like…

A: Given, The statement to check true or false?           To find, Experimental studies like RCTs are…

Q: When the treatment effect is small and you fail to reject the null when in actuality, there was a…

A: Type I error (α): The probability of rejecting the null hypothesis when it is actually true is…

Q: oup) was asked to consume the health drink for a certain period of time and the other group (the…

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Q: A researcher is interested in gender differences in attitudes toward dating. Specifically, she wants…

A: The researcher is studying about how the dating behavior depends on the gender. So the gender is…

Q: What is the explanatory variable ?

A: What is the explanatory variable ?

Q: Suppose that you have bivariate data for an entire population. a. How would you decide whether an…

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Q: Determine the test statistic for the interaction effect.

A: In a study, a random sample of 20 adults related to effectiveness of advertisement. Data is:…

Q: Report an appropriate hypothesis test for a positive linear relationship and use a 5% significance…

A: The p value lies between 0 & 1. The incorrect options from the available options is, A ,E and F.…

Q: In a two-way ANOVA, the interpretations of the main effects make sense only when the interaction…

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Q: Dr. Guidry conducts a study examining the relationship between the number of friends one has and the…

A: Given Information: Dr Guidry is interested in examining the relationship between the number of…

Q: If the omitted variable is negatively correlated with the treatment and has a positive impact on the…

A: If the increase in one variable tends to decrease the second variable under consideration, there…

Q: Over the course of a year, you find a strong, positive correlation between ice cream sales and pool…

A: Correct option is Spurious

Q: ness leading to death. The results will be compared to with those obtained from mothers of a group…

A: Increased Risk of Death from acute respiratory infection: bottle-fed infants breast-fed infants…

Q: A researcher is interested in investigating the relationship between sugar consumption and weight…

A: Given Information: A researcher is interested in examining the relationship between high school…

Q: Suppose we wish to compare the health status of two groups of people. What variables might we use to…

A: Given information: The investigator is specially interested to compare the health status of two…

Q: A significant interaction was found between depression, social support and GPA. These results should…

A: Type I Error: Type I error occures when the results of research gives difference exists between the…

Q: The article "Americans are 'Getting the Wrong Idea' on Alcohol and Health"† reported that…

A: The correct options are, b.Someone who is more active is more likely to seek out healthier food.…

Q: Is the dependent variable is always dependent to the independent variable(s) of the study? Why?

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Q: A researcher plans to do a study to see whether people who eat an all carbohydrate meal have…

A: From the question we know that the independent variable is 'Type of meal' which has two levels…

Q: A study was conducted to compare oral and intravenous antibiotics in patients with lower respiratory…

A: Introduction: In the scenario study, antibiotic use was investigated in patients with lower…

Q: On a trial basis, State College admitted 300 students from the lowest third of their high school…

A: For a study, the 300 students who have lowest third graduation grades, divided into 3 groups where…

Q: A researcher notes that there seems to be a difference in the prevalence of individuals who are…

A:

Q: The x2-test for independence is a useful tool for establishing a causal relationship between two…

A: The chi square test for independence is a useful tool for establishing a casual relationship between…