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A researcher was interested in whether a new advertisement campaign increased favorability of a political candidate. She took 17 random participants and randomly assigned them to either a control group who did not watch the ad, or a treatment group who did watch the ad. These are the favorability scores for each subject after being exposed to the control or treatment groups. control <- C(33.3, 27.5, 30.0, 15.5, 17.5, 16.0, 33.3, 11.0) treatment <- c(25.1, 36.7, 59.0, 31.0, 19.9, 26.5, 55.1, 29.9, 44.4) Perform a two-tailed two-sample Student's t-test on these data in R. What are the degrees of freedom [Select] 15 13.9 What is the observed t-value? I 16 17 What is the lower bound of the 95% Confidence Interval for the difference in means? [Select] What is the p-value? (Select] Does this test suggest that there is a real difference in the means of favorability scores between the control and treatment populations? (Select]
A researcher was interested in whether a new advertisement campaign increased favorability of a political candidate. She took 17 random participants and randomly assigned them to either a control group who did not watch the ad, or a treatment group who did watch the ad. These are the favorability scores for each subject after being exposed to the control or treatment groups. control <- C(33.3, 27.5, 30.0, 15.5, 17.5, 16.0, 33.3, 11.0) treatment <- c(25.1, 36.7, 59.0, 31.0, 19.9, 26.5, 55.1, 29.9, 44.4) Perform a two-tailed two-sample Student's t-test on these data in R. What are the degrees of freedom ? [Select] What is the observed t-value [Select ] -2.4 -2.354 What is the lower bound of th -2.414 he difference in means? [Select] What is the p-value? (Select] Does this test suggest that there is a real difference in the means of favorability scores between the control and treatment populations? (Select]
A researcher was interested in whether a new advertisement campaign increased favorability of a political candidate. She took 17 random participants and randomly assigned them to either a control group who did not watch the ad, or a treatment group who did watch the ad. These are the favorability scores for each subject after being exposed to the control or treatment groups. control <- C(33.3, 27.5, 30.0, 15.5, 17.5, 16.0, 33.3, 11.0) treatment <- C(25.1, 36.7, 59.0, 31.0, 19.9, 26.5, 55.1, 29.9, 44.4) Perform a two-tailed two-sample Student's t-test on these data in R. What are the degrees of freedom ? [Select] What is the observed t-value ? (Select] What is the lower bound of the 95% Confidence Interval for the difference in means? [Select] What is the p-value [Select ] 0.016 0.013 Does this test sugge 0.033 in the means of favorability scores between the control and treatment populations? (Select]
A researcher was interested in whether a new advertisement campaign increased favorability of a political candidate. She took 17 random participants and randomly assigned them to either a control group who did not watch the ad, or a treatment group who did watch the ad. These are the favorability scores for each subject after being exposed to the control or treatment groups. control <- C(33.3, 27.5, 30.0, 15.5, 17.5, 16.0, 33.3, 11.0) treatment <- C(25.1, 36.7, 59.0, 31.0, 19.9, 26.5, 55.1, 29.9, 44.4) Perform a two-tailed two-sample Student's t-test on these data in R. What are the degrees of freedom ? [Select] What is the observed t-value ? (Select] What is the lower bound of the 95% Confidence Interval for the difference in means? [Select] What is the p-value? (Select] Does this test suggest that there is a real difference in the means of favorability scores between the control and treatment populations [ Select ] Yes No
A researcher was interested in whether a new advertisement campaign increased favorability of a political candidate. She took 17 random participants and randomly assigned them to either a control group who did not watch the ad, or a treatment group who did watch the ad. These are the favorability scores for each subject after being exposed to the control or treatment groups. control <- C(33.3, 27.5, 30.0, 15.5, 17.5, 16.0, 33.3, 11.0) treatment <- C(25.1, 36.7, 59.0, 31.0, 19.9, 26.5, 55.1, 29.9, 44.4) Perform a two-tailed two-sample Student's t-test on these data in R. What are the degrees of freedom ? [Select] What is the observed t-value ? (Select] What is the lower bound of the 95% Confidence Interval for the difference in means [Select] -25.3 -25.5 What is the p-value? (Select] -Inf Does this test suggest that there is a real difference in the means of favorability scores between the control and treatment populations? (Select]