Problem Set 2 (1)

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Long Beach City College *

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307

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Communications

Date

Apr 3, 2024

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docx

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3

Uploaded by DeaconLightning1015

Problem Set 2 – COMM 307 by Dr. Sunyoung Park Your responses need to be written in full sentences and your own words. Do NOT copy and paste the lecture slides or online resources (including AI usage) . Plagiarized responses will automatically receive zero. Your answers need to be typed (you can hand-write calculation process if you want to) . Your answers will be graded based on completeness, accuracy, and presentation & clarity. 6.25 points * 8 Questions = 50 Points Q1 – Q3 are based on the following. Assume that you are reading a study on political blogs. For the study, the researchers conducted a nationally representative phone survey of 1,000 people and asked them about whether they regularly read political blogs or not in addition to several questions about their trust in mainstream media. The researchers found that people who regularly read political blogs have less trust toward mainstream media than people who do not regularly read political blogs, and conclude that reading political blogs causes people to have less trust in mainstream media . 1. Is the study observational or experimental? Explain your answer. 2. Identify a potential confounding variable (a potential third variable that can account for the relationship). Explain how this confounding variable could undermine the causal claim of the study described above. 3. Explain how you would re-design a study to address causal relationship between reading political blogs and trust toward mainstream media.
Q4 – Q6 are based on the following. Below is a data of football statistics for two NFL quarterbacks playing during the same time period: Philip Rivers and Aaron Rodgers from 2012-2019. Touchdown Passes Thrown Season Philip Rivers Aaron Rodgers 2019 23 26 2018 32 25 2017 28 16 2016 22 40 2015 29 31 2014 31 38 2013 32 17 2012 26 39 4. Compute the average number of touchdown passes thrown by Rivers and Rodgers from 2012-2019. Show all your calculation process AND answer. 5. Compute the standard deviation for touchdown passes thrown. Show all your calculation process AND answer. S = √ ∑ ( X − X ) 2 N − 1
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