A multinational corporation is conducting a study to see how its em- ployees in five different countries respond to three gifts in an incentive scheme. The numbers of employees who choose each of the three gifts (G1 to G3) in each of the five countries (A to E) are given in the table in 'Dataset6' in the Excel document.
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Hello I need help answering questions 1 and 2 attached. Thank you very much.
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- Brunoni et al. (2006) investigated whether the combination of low-level electrical brain stimulation, transcranial direct current stimulation (tDCS), and sertraline, a commonly used SSRI antidepressant, would be effective in decreasing depressive symptoms in a group of clinically depressed individuals. The researchers randomly assigned participants to one of two medication conditions (placebo or sertraline) and to one of two brain electrical stimulation conditions (sham tDCS or active tDCS). How should the ANOVA used to analyze the data be labeled? a. 2 × 2 between-groups ANOVA b. 4 × 2 between-groups ANOVA c. 4 × 2 within-groups ANOVA d. 2 × 2 within-groups ANOVA Clear my choiceThe National Turkey Association wants to experiment with the effects of three different feed mixtures on weight gain in poults. Because no experience exists regarding the three mixtures, no assumptions regarding the population distribution of weights exist. To study the effects of the three mixtures, five poults were given feed A, six were given feed B, and five were given feed C over a 3-week period. At the 0.05 level of significance test the hypothesis that there is no effect of feed mixture on weight. Weight (in pounds) Feed Mixture A Feed Mixture B Feed Mixture C 11.2 12.6 11.3 12.1 10.8 11.9 10.9 11.3 12.4 11.3 11.0 10.6 12.0 12.0 12.0 10.7The National Turkey Association wants to experiment with the effects of three different feed mixtures on weight gain in poults. Because no experience exists regarding the three mixtures, no assumptions regarding the population distribution of weights exist. To study the effects of the three mixtures, five poults were given feed A, six were given feed B, and five were given feed C over a 3-week period. At the 0.05 level of significance test the hypothesis that there is no effect of feed mixture on weight. Weight (in pounds) Feed Mixture A Feed Mixture B Feed Mixture C 11.2 12.6 11.3 12.1 10.8 11.9 10.9 11.3 12.4 11.3 11.0 10.6 12.0 12.0 12.0 10.7 b. At the 0.10 level of significance, state the decision rule. (Round your answer to 3 decimal places.) c. Compute the value of the test statistic. (Round your answer to 3 decimal places.)
- During the Movement Control Order period due to Covid-19 pandemic, employees have been asked to work from home where meetings and appointments are done online. From a recent survey, 355 out of 1000 employees from State A and 498 out of 1200 employees from State B claimed that they prefer to use Google Meet for their online meetings. Based on the sample data, is there any significant di↵erence between the proportions of employees from State A and State B who prefer to use Google Meet for their online meetings? Test at α = 0.01.In a study made on the value of proctoscopy in diarrheal disorders of infancy, 82 randomly selected patients admitted to the University of Santo Tomas Hospital from May 1983 to July 1983 were studied. Of the 82 patients, 65 were cases of diarrhea and the remaining 17 patients served as the control. The diarrhea group had been classified into infectious and non-infectious based on the results of the bacteriologic and viral studies on fecal samples. The infectious group was further subdivided into toxigenic and tissue-invasive according to the etiologic agent isolated. All of the patients underwent improvised proctoscopy and the appearance of the rectal mucosa was noted. In the control group, 16 (94.1%) had pink rectal mucosa and only 1 (5.8%) was noted to have erythematous mucosa. Of the 9 patients belonging to the tissue-invasive subgroup, 8 (88.8%) had erythema and bleeding of the mucosa, while 1 (11%) had only erythema. In contrast, those in toxigenic diarrhea subgroup showed…Six researchers at different universities agree to carry out exactly the same social psychology experiment involving three treatment conditions. When the studies are complete, they pool their data to study outcome variable Y, and they carry out a two-way ANOVA. Assuming that 10 subjects were randomly assigned to each of the treatments at each of the sites, what are the degrees of freedom associated with each of the variance components outlined in the ANOVA Table shown below? Two versions of the analysis are planned. In the first analysis, the researchers restrict their interest to the six specific sites included in the joint research. In the second analysis they consider the six universities to be a sample from the population of American universities. For each analysis, look up the critical F values for a =.05, and enter them into the table below. (The critical value is the number the F statistic must exceed to be considered statistically significant at the .05 level.) Also…
- A data set from a study that examined the effect of a specific diet on blood pressure is provided . Participants (n = 72) were randomly assigned either to a group that was put on the diet (Diet = Present) or to a group that was not put on the diet (Diet = Absent), and researchers wanted to know whether the diet had a significant impact on blood pressure. Fully interpret the results in the context of this study (i.e., report the conclusions as related to the research question).A sports betting company is testing the effectiveness of its online ads and has developed a classification model that predicts whether a potential customer will respond to its offer using information in the potential customer's browser history (cookies, etc.). Out of a test dataset of 1,000 customers, the 100 customers most likely to respond (according to the model) are identified and it is discovered that 14 of these actually did respond to the online ads. In the entire test dataset of 1,000 customers, only 39 customers responded to the ad. What is the lift of the classification model for the set of 100 customers it identified as most likely to respond? If required, round your answer to two decimal places. I got 3.59 as the answer and its incorrect.A random sample of 100 people from region A and a random sample of 100 people from region B were surveyed about their grocery-shopping habits. From the region A sample, 16 percent of the people indicated that they shop for groceries online. From the region B sample, 24 percent of the people indicated that they shop for groceries online. At the significance level of α=0.05, do the data provide convincing statistical evidence that there is a difference between the two regions for the population proportions of people who shop online for groceries? Complete the appropriate inference procedure to support your answer.
- A research group is interested in the association between vitamin E supplementation and a decreased risk for osteoporosis in a group of elderly women. The team randomly samples a group of women potentially enrolled in the study after a strict set of inclusion criteria have been met, and pairs each woman receiving the supplementation with two women receiving a placebo based on a number of characteristics such as BMI, education, and socio-economic status. The data compiled after 10 years of follow up were analyzed using conditional logistic regression. Which of the following methods to reduce confounding was not employed in the above scenario? Stratification Regression Restriction MatchingConduct a two-factor ANOVA to examine the effects of 'maternal diet' (‘diet’: No alcohol, vs. alcohol) and age (adolescent rat vs. adult rat) on passive avoidance (‘pa’). State the three alternative hypotheses in words. State the alternative hypothesis of the interaction in terms of whether the effects of maternal diet (alcohol vs. not alcohol) on passive avoidance depend on the levels of age (i.e., on whether the rat is an adolescent or an adult rat).A sociologist wants to investigate the question, "Is there a relationship between texting during class and grade-point-average (GPA) among high school seniors in a large district?" Which study design is most appropriate? Before the semester starts, randomly select 40 seniors from each high school who do not text during class. Assign 20 to the texting treatment group (text three or more times during every class meeting) and 20 to the control group (no texting during class). At the end of the semester, obtain each student’s GPA from the appropriate admissions and records office. Compare the GPA of students who routinely text during class to the GPA of students who do not text during class. Before the semester starts, randomly select 40 seniors from each high school who do not text during class. Assign 20 to the texting treatment group (text three or more times during every class meeting) and 20 to the control group (no texting during class). At the end of the semester,…