MA 220 - Statistics (23)Ch 1 - Data Collection Vocabulary 2Section 1.5To investigate students' opinions on a proposed tuition increase, a reporter from the school newspaper polled herroommates and friends. 67% of those surveyed opposed the proposed tuition increase. Discuss potential problems withthis study.Are the flaws in this study due to the sampling method or the survey itself?After receiving criticism for polling her friends, the same reporter from Problem 1 decided it would be better to get asample from other students. She plans to choose a location on campus and poll everyone who is willing to respond toher survey. Discuss the pros and cons of using the following locations.a. The main entrance of the school library.b. The hallway outside of a senior-level biology class.c. The hallway outside the auditorium in which the freshman psychology classes are taught.d. A large parking lot on campus.Section 1.6A University of Toronto psychology professor conducted research in which 315 first-graders were randomly assigned tokeyboard, singing, drama, violin, or no lessons. The lessons lasted for 36 weeks. Each first-grader was administered theWISC-III exam at the start of the study and then at the end of the 36 weeks. Results of the study showed that the scoresfor the keyboard and singing students improved significantly more than those of the drama, violin, or no lessonstudents.a. Why is this a completely randomized designb. What are the treatments?c. Think of some factors in the study. Name one factor is controlled? Name one factor is manipulated?d. Identify the subjects specifically.

Section 1.5An increase in tuition fee is proposed and a survey study is conducted by a reporter from…

Answered: MA 220 - Statistics (23) Ch 1- Data…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Pick a sample problem where despite correlation, causation cannot be reasonable argument.
If a researcher failed to use a random sample, how would this affect the research conclusion? If a researcher failed to use random assignment, how would this affect the research results?
Students often confuse the concepts of Random Sampling and Random Assignment (probably because they both contain the same word "random"), but these are different tools designed to solve different problems. This discussion is designed for students to help each other build a complete understanding, and clearly separate these as two distinct concepts. Discuss the similarities and differences between these, as well as the research problems they are used to solve.
Part 1: Consider sampling in statistics. Why do we take samples? Why do we want representative samples (and what does it mean)? Part 2: Are there limitations to the data source and your sample (For example, my data and sample is about animals)? Why? How might you design this differently to get a more representative sample? Further - in your opinion is there still value to be gained even if a sample is not representative?
(6) A student surveys some students on campus in the evening and finds that 16 out of 20 of the students she interviewed are part time students. She uses the data to estimate the percentage of all students who are part time. What type of bias is present in her sample?
A survey asked students at a high-school football game whether a fund for extra-curricular activities should be used to buy new equipment for the football team or instruments for the school band. Classify the type of bias demonstrated in this scenario. Think about how the survey process could be changed to eliminate/reduce bias.
The Bureau of Labor Statistics reports that the official unemployment rate for Black people was 10.4% and 4.7% for White people in February 2015. Select all correct answers for this question. O The samples of white and black people are independent. The explanatory variable is the unemployment rate. The response variable is the unemployment rate. The response variable is race.
By a small margin, Facebook remains the top choice of social media over all ages, with 29% using Facebook most often among those using social media sites. However, more visually oriented social networks such as Snapchat and Instagram continue to draw in younger audiences. When asked "Which one social networking brand do you use most often?" the results in the table show the top brands chosen by Americans aged 12-34 who currently use any social networking site or service. Social M edia Site Faceboo k Snapchat Instagra m Twitter Percentage That Use Most Often 29 28 26 6 20 (a) What is the sum of the percentages for these top social media sites? Give your answer as an exact number. Macmillan Learning top social media sites: What percent of Americans aged 12-34 use other social media sites most often? Give your answer as an exact number. other social media sites: do %
One study found a negative correlation between participant’s age and hours of sleep they got (as they got older, they slept less). Which additional fact would lead you to believe that the relationship between age and hours of sleep is one of causation and not correlation? Jim is 63 and sleeps more than he did when he 47. Josie is 40 and sleeps fewer hours than when she was 30. The participants were randomly selected, the sample size was large, and the participants did not know the goal of the study. Jennie sometimes has difficulty sleeping.
Give me an example of a research scenario where you would use an independent samples t-test. You can set up a situation where there is an experimental group and a control group, or maybe you want to compare two other groups of people (parents and non-parents, gender, partnered and single, etc). Give us a summary of what you would want to study, who your sample participants would be, why an independent samples t-test would be the best fit, and what statistically significant results would mean. Don't forget to include your research and null hypotheses!
Northside High wants to estimate the number of seniors who plan to go to a 4-year college. Answer the following. (a) Which of the following surveys probably would best represent the entire population of seniors? 20 seniors are randomly selected; 17 plan to go to a 4-year college. 20 Chess Club members are randomly selected; 14 plan to go to a 4-year college. O 20 honor roll students are randomly selected from the senior class; 18 plan to go to a 4-year college. (b) There are 500 seniors at Northside High. Using your answer from part (a), estimate the number of seniors who plan to go to a 4-year college. ☐ seniors
Sample surveys on sensitive issues can give different results depending on how the question is asked. A University of Wisconsin study randomly divided 2400 respondents into three groups. All participants were asked if they had ever used cocaine. One group of 800 was interviewed by phone; 21% said they had used cocaine. Another 800 people were asked the question in a one-on-one personal interview; 25% said “Yes.” The remaining 800 were allowed to make an anonymous written response; 28% said “Yes.”101. Was this an experiment or an observational study? Justify your answer.2. Make a two-way table of responses about cocaine use by how the survey was administered.3. Are the differences between the three groups statistically significant? Give appropriate evidence to support your answer

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