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 ]
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
Problem 8CR
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Question
![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 ? ISelect]
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? ( Select]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9feb3a3e-3311-4656-ac65-8e4126cbb56e%2F06cdf0c1-e674-4a13-af39-219be828ba3a%2Fsw7xttk_processed.jpeg&w=3840&q=75)
Transcribed Image Text: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 ? ISelect]
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? ( Select]
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