A researcher was interested in whether the voter likelihoods of individuals would be higher if they were exposed to ads via text messages. She surveyed the voting likelihood of 8 random individuals who received no text messages (control) and 9 random individuals who received text messages (treatment). These were the voter likelihoods of participants in each group: treatment <- c(15.5, 17.6, 23.3, 26.4, 19.9, 16.6, 19.1, 13.6, 17.9, 19.9) control<- c(11.5, 20.5, 15.6, 12.6, 20.1, 18.8, 18.5, 11.1, 10.0) Perform a one-tailed two-sample Welch's t-test on these data in R, to test if the data from the treatment group comes from a population with a mean greater than the control group. 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 the population mean of the control group is smaller than the treatment group? I Select ]

A researcher was interested in whether the voter likelihoods of individuals would be higher if they were exposed to ads via text messages. She surveyed the voting likelihood of 8 random individuals who received no text messages (control) and 9 random individuals who received text messages (treatment). These were the voter likelihoods of participants in each group: treatment <- c(15.5, 17.6, 23.3, 26.4, 19.9, 16.6, 19.1, 13.6, 17.9, 19.9) control<- c(11.5, 20.5, 15.6, 12.6, 20.1, 18.8, 18.5, 11.1, 10.0) Perform a one-tailed two-sample Welch's t-test on these data in R, to test if the data from the treatment group comes from a population with a mean greater than the control group. 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 the population mean of the control group is smaller than the treatment group? I Select ]

College Algebra

10th Edition

ISBN:9781337282291

Author:Ron Larson

Publisher:Ron Larson

Chapter8: Sequences, Series,and Probability

Section8.7: Probability

Problem 4ECP: Show that the probability of drawing a club at random from a standard deck of 52 playing cards is...

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