hello can you help me? Which of the following may be connected to sample or sample size in relation topublic health? *I. Sample is a fraction of the population of interestII. Sample must have the same characteristics as the population to arrive at a correct inferenceII. In sampling, collection of relatively large entities or objects are observedIV. Exclusion of eligible participant is only applicable in population selectionI and III onlyI, Il and IIIO I, I, II and IVRefer to the given case below. How many independent variables were studied inthe given case? *Traveler's diarrhea (TD) is the most frequent disease among people from industrialized countries whotravel to less developed ones, especially sub-Saharan Africa, Southern Asia and South America. Themost common bacteria causing TD is enterotoxigenic Escherichia coli (ETEC). The WC/rBS choleravaccine (Dukoral) has been shown to induce cross-protection against ETEC by means of the Bsubunit of the cholera toxin. The aim of the study was to evaluate the effectiveness of the WC/rBScholera vaccine in preventing TD. The vaccinated group (n = 544 travelers) included peoplevaccinated with the WC/rBS cholera vaccine, and the non-vaccinated group (n = 530 travelers) bypeople not vaccinated. The cumulative incidence rate of TD was 1.69 in vaccinated and 2.14 in non-vaccinated subjects. The adjusted relative risk of TD in vaccinated travelers was 0.72 (95% Cl: 0.58-0.88) and the adjusted vaccination effectiveness was 28% (95% CI: 12-42).O 1No independent variable present23 Refer to the given case below. What was the dependent variable in the givencase? *Traveler's diarrhea (TD) is the most frequent disease among people from industrialized countries whotravel to less developed ones, especialy sub-Saharan Africa, Southern Asia and South America. Themost common bacteria causing TD is enterotoxigenic Escherichia coli (ETEC). The WC/rBS choleravaccine (Dukoral) has been shown to induce cross-protection against ETEC by means of the Bsubunit of the cholera toxin. The aim of the study was to evaluate the effectiveness of the WC/rBScholera vaccine in preventing TD. The vaccinated group (n = 544 travelers) included peoplevaccinated with the WC/rBS cholera vaccine, and the non-vaccinated group (n = 530 travelers) bypeople not vaccinated. The cumulative incidence rate of TD was 1.69 in vaccinated and 2.14 in non-vaccinated subjects. The adjusted relative risk of TD in vaccinated travelers was 0.72 (95% CI: 0.58-0.88) and the adjusted vaccination effectiveness was 28% (95% CI: 12-42).Occurrence of traveler's diarrheaIndustrialized country using DukoralETEC infectionwc/rBS cholera vaccination statusWhich among the following statements about the different types of variables arecorrect? "I. Independent variables always have an effect on dependent variablesII. Covariates have an effect on dependent variablesII. The dependent variables are the variables being manipulatedIV. Independent variables explain the presumed effect to X variablesOnly one of the statements is correctO Two of the statements are correctO All of the statements are correctO Three of the statements are correct

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hello can you help me? Which of the following may be connected to sample or sample size in relation topublic health? *I. Sample is a fraction of the population of interestII. Sample must have the same characteristics as the population to arrive at a correct inferenceII. In sampling, collection of relatively large entities or objects are observedIV. Exclusion of eligible participant is only applicable in population selectionI and III onlyI, Il and IIIO I, I, II and IVRefer to the given case below. How many independent variables were studied inthe given case? *Traveler's diarrhea (TD) is the most frequent disease among people from industrialized countries whotravel to less developed ones, especially sub-Saharan Africa, Southern Asia and South America. Themost common bacteria causing TD is enterotoxigenic Escherichia coli (ETEC). The WC/rBS choleravaccine (Dukoral) has been shown to induce cross-protection against ETEC by means of the Bsubunit of the cholera toxin. The aim of the study was to evaluate the effectiveness of the WC/rBScholera vaccine in preventing TD. The vaccinated group (n = 544 travelers) included peoplevaccinated with the WC/rBS cholera vaccine, and the non-vaccinated group (n = 530 travelers) bypeople not vaccinated. The cumulative incidence rate of TD was 1.69 in vaccinated and 2.14 in non-vaccinated subjects. The adjusted relative risk of TD in vaccinated travelers was 0.72 (95% Cl: 0.58-0.88) and the adjusted vaccination effectiveness was 28% (95% CI: 12-42).O 1No independent variable present23 Refer to the given case below. What was the dependent variable in the givencase? *Traveler's diarrhea (TD) is the most frequent disease among people from industrialized countries whotravel to less developed ones, especialy sub-Saharan Africa, Southern Asia and South America. Themost common bacteria causing TD is enterotoxigenic Escherichia coli (ETEC). The WC/rBS choleravaccine (Dukoral) has been shown to induce cross-protection against ETEC by means of the Bsubunit of the cholera toxin. The aim of the study was to evaluate the effectiveness of the WC/rBScholera vaccine in preventing TD. The vaccinated group (n = 544 travelers) included peoplevaccinated with the WC/rBS cholera vaccine, and the non-vaccinated group (n = 530 travelers) bypeople not vaccinated. The cumulative incidence rate of TD was 1.69 in vaccinated and 2.14 in non-vaccinated subjects. The adjusted relative risk of TD in vaccinated travelers was 0.72 (95% CI: 0.58-0.88) and the adjusted vaccination effectiveness was 28% (95% CI: 12-42).Occurrence of traveler's diarrheaIndustrialized country using DukoralETEC infectionwc/rBS cholera vaccination statusWhich among the following statements about the different types of variables arecorrect? &#34;I. Independent variables always have an effect on dependent variablesII. Covariates have an effect on dependent variablesII. The dependent variables are the variables being manipulatedIV. Independent variables explain the presumed effect to X variablesOnly one of the statements is correctO Two of the statements are correctO All of the statements are correctO Three of the statements are correct

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