In a recent study, young adults (18-25 years) were randomly assigned to one of two treatments to increase seat belt use. The intervention group received Safe Vehicle Engagement (SAVE) intervention, a 6-week automated interactive text message program, including weekly seat belt use queries with feedback and goal support to increase seat belt use. The control group received similar queries but no additional feedback.The primary objective is to assess whether there is an association between treatment (SAVE vs control) and self-report of always using a seat belt over the past 2 weeks at the 6-week follow-up. Below is the 2x2 table of treatment and primary endpoint. Always wearing a seat beltNot always wearing a seat beltSAVE Intervention3448Control1561Questions: (1) Estimate an appropriate absolute measure of association and 95% confidence interval (CI) comparing participants who received SAVE intervention to those who received control treatment. Be sure to interpret.(2) Estimate an appropriate relative measure of association and 95% confidence interval (CI) comparing participants who received SAVE to those who received control treatment. Be sure to interpret.(3) Based on the CI in question 2, what can we conclude about the relationship between SAVE intervention and always using a seat belt? Be sure to justify your answer.

Answered: n a recent study, young adults (18-25…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Question

In a recent study, young adults (18-25 years) were randomly assigned to one of two treatments to increase seat belt use. The intervention group received Safe Vehicle Engagement (SAVE) intervention, a 6-week automated interactive text message program, including weekly seat belt use queries with feedback and goal support to increase seat belt use. The control group received similar queries but no additional feedback.

The primary objective is to assess whether there is an association between treatment (SAVE vs control) and self-report of always using a seat belt over the past 2 weeks at the 6-week follow-up. Below is the 2x2 table of treatment and primary endpoint.

	Always wearing a seat belt	Not always wearing a seat belt
SAVE Intervention	34	48
Control	15	61

Questions:

(1) Estimate an appropriate absolute measure of association and 95% confidence interval (CI) comparing participants who received SAVE intervention to those who received control treatment. Be sure to interpret.

(2) Estimate an appropriate relative measure of association and 95% confidence interval (CI) comparing participants who received SAVE to those who received control treatment. Be sure to interpret.

(3) Based on the CI in question 2, what can we conclude about the relationship between SAVE intervention and always using a seat belt? Be sure to justify your answer.

Expert Solution

Step 1: Given Information:

The young adults under the two treatments to increase seat belt use. The observation is shown below,

	Always wearing a seatbelt	Not always wearing a seatbelt
SAVE intervention	34	48
Control	15	61

Confidence Level, $1 minus alpha equals 0.95$

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