1. For each of the given scenarios do the following: state whether the study is
ID: 3354275 • Letter: 1
Question
1. For each of the given scenarios do the following: state whether the study is observational or experimental; state the population and the sample; state whether the sample is a random sample of the population A company is trying to determine how user friendly their new website is. Randomly selected visitors to the website are asked to complete a short survey before leaving the site. The survey consists of several questions where the user is asked to rank certain features of the website using a scale from 1 to 5. Based on the data collected the website can be revised. a. b. A certain car manufacturer claims that its vehicles will not need major repairs, those costing more than S500, until after 70,000 miles. To determine the validity of this claim an independent researcher gathers service records from a random sample of repair shops who service this type of vehicle. In order to test the effectiveness of a new training program that all employees at the company must participate in, a random sample of employees was asked to complete a set of tasks and then time it took to complete the tasks was noted. c. Is it possible to predict college GPA from High School GPA? To answer this question a group of researchers randomly selected 10,000 college students from the United States and recorded their GPA from both high school and college. d. It has been claimed that a mere 18% of people stick with their New Year's Resolution throughout the year. To test this claim I randomly asked people on UNL campus how long they were able to keep their 2017 resolution. From my sample I found that 31% of people stick with their New Year's Resolution throughout the year. e.Explanation / Answer
a. The study is observational.
Population: All visitors to the website.
Sample: Visitors to the website who are asked to complete a short survey before leaving the website.
Yes the sample is a random sample from the population.
b. The study is observational.
Population: All the repair shops that service the specified type of vehicle.
Sample: Repair shops selected by the independent researcher who service the specified type of vehicle.
Yes the sample is a random sample from the population.
c. The study is observational.
Population: All employees of the company.
Sample: Employees of the company who were asked to complete a set of tasks.
Yes the sample is a random sample from the population.
d. The study is observational.
Population: All college students in United States.
Sample: 10,000 college students from United States selected by the group of researchers.
Yes the sample is a random sample from the population.
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