Exam 14: Censuses, Surveys, Polls, and Studies: the Joys of Collecting Data

A consumer reports group is interested in which medicine works the best. The researchers take 100 volunteers who experience regular head-aches and who are currently not taking any medications. The Researcher split them into four groups of 25 individuals. Group 1 receives four 100-mg doses of Excedrin each day, group 2 receive four 100-mg doses of Tylenol each day, group 3 receives four 100-Mg doses of Advil each day, and group 4 receives four 100-mg doses of a sugar pill each day. After One week, the researchers compare the number of reported head-aches. If the individuals in each group Were unaware of which drug they were receiving, but the researchers knew which group were paired With which drug, then this study is said to be

Refer to the following article. Spring Is Still The In Thing Associated Press - In order to determine how American undergraduate college Students feel about eliminating spring break in order to finish spring term a week Early, a survey was conducted. Two hundred undergraduate students from the University of Miami (FL) were interviewed. Both of the interviewers hired to conduct The survey were told to interview 25 freshmen, 25 sophomores, 25 juniors, and 25 Seniors. Of the 200 students interviewed, 20% were in favor of the elimination of Spring break, 70% were opposed, and 10% had no opinion.What is the population of interest in this study?

75% of Toyota automobiles come equipped with side curtain airbags. This conclusion was made after observing production data regarding all Toyota automobiles. This value of 75% is called a what?

determine the effects of a new high carbohydrate diet intended to treat Depression of prisoners at maximum security prisons, a researcher conducts a study. Five hundred inmates at the Burlington Maximum Security Penitentiary are selected To participate in the study. The researcher puts the 400 inmates not in solitary Confinement on the new diet. The 100 inmates in solitary confinement are given their Regular meals. The 400 inmates on the new diet are not aware that they being Studied or that their diet has been modified, but have many fewer reported cases of Depression after 30 days. -Refer to the situation described above ; how large was the sample?

In order to get the opinions of residents of the village of Essex Junction, Vermont, the Village Office on Voting Standards sends a questionnaire to 1000 individuals randomly chosen from the list of all registered voters in the village. Of the 1000 questionnaires sent, 480 are returned. The sample frame for this survey is (a) the 1000 individuals chosen randomly from the list of all registered voters. (b) the list of all registered voters in the village. (c) all residents of the village. (d) the Village Office on Voting Standards. (e) None of the above.

students spend less time in the library when compared to non-first-year students. This study was conducted by the Student Life Department on the campus of Essex University in Fowler, New Jersey. The university has a total of 8245 undergraduate students of whom 2316 are first year students. The Student Life Department randomly selected 1600 students consisting of 800 first-year students and 800 non-first-year students and sent out email questionnaires to each. Of the 800 students first-year students, 718 replied to the survey, and of the 800 non-first-year students, 659 replied to the survey. On average, the first-year students reported spending 18.2 hours at the library during a typical week of the academic semester whereas non-first-year students reported spending 21.5 hours, on average. -Refer to the situation described above ; how large was the sample?

A randomized controlled study is done to determine whether or not taking a specific herbal supplement causes stress levels to decrease. Sixty individuals are broken into two groups of size thirty. The first group receives a 10 mg dose of an herbal supplement each day while the second group receives a 10 mg dose of a sugar pill made to resemble the herbal supplement each day. After two months the stress levels of each group are measured. The 10 mg sugar pill is an example of a what?

Every student who lives on campus at your university is required to fill out a room questionnaire before he or she is allowed to return his or her dorm key. After all of the data is collected, the director Of Student Life announces that 94% of students who lived on campus are happy with the current Conditions of the dorm rooms. This study is an example of a

Refer to the following article. Freshmen Not So Fresh When It Comes To Study Habits Associated Press - A recent study of all US college students has shown that first-year students spend less time in the library when compared to non-first-year students. This study was conducted by the Student Life Department on the campus of Essex University in Fowler, New Jersey. The university has a total of 8245 undergraduate students of whom 2316 are first year students. The Student Life Department randomly selected 1600 students consisting of 800 first-year students and 800 non-first-year students and sent out email questionnaires to each. Of the 800 students first-year students, 718 replied to the survey, and of the 800 non-first-year students, 659 replied to the survey. On average, the first-year students reported spending 18.2 hours at the library during a typical week of the academic semester whereas non-first-year students reported spending 21.5 hours, on average. What is the population of interest in this study?

A factory that produces taco-shells makes a total of 20,000 shells in a batch. A batch is successful and can be shipped to a customer if no more than 2000 of the shells are broken. The quality control agent for the company randomly picks 400 shells from the batch and finds that 60 are broken. Based on the technique of single-estimation, is the batch successful? Explain using statistics.

A Vermont farmer has four different types of cows on his farm, Aryshire, Friesian, Galloway, and Jersey. The farmer wants to determine the average amount of milk produced by his cows, so he randomly selects ten cows from each of the four different types and records their production for one week. Is this an example of quota-sampling? Explain.

Some of the students at your university who live in the dorm buildings are asked to fill out a room questionnaire before they return their dorm key. After all of the questionnaires have been collected, The director of Student Life announces that 94% of students who lived on campus are happy with the Current conditions of the dorm rooms. This study is an example of a

Associated Press - In order to determine how American undergraduate college Students feel about eliminating spring break in order to finish spring term a week Early, a survey was conducted. Two hundred undergraduate students from the University of Miami (FL) were interviewed. Both of the interviewers hired to conduct The survey were told to interview 25 freshmen, 25 sophomores, 25 juniors, and 25 Seniors. Of the 200 students interviewed, 20% were in favor of the elimination of Spring break, 70% were opposed, and 10% had no opinion -Refer to the situation described above ; how large was the sample?

students spend less time in the library when compared to non-first-year students. This study was conducted by the Student Life Department on the campus of Essex University in Fowler, New Jersey. The university has a total of 8245 undergraduate students of whom 2316 are first year students. The Student Life Department randomly selected 1600 students consisting of 800 first-year students and 800 non-first-year students and sent out email questionnaires to each. Of the 800 students first-year students, 718 replied to the survey, and of the 800 non-first-year students, 659 replied to the survey. On average, the first-year students reported spending 18.2 hours at the library during a typical week of the academic semester whereas non-first-year students reported spending 21.5 hours, on average. -Refer to the situation described above ; what is the sampling frame for this study?

A math student is interested in counting the number of jelly beans in a jar. The student opens the jar and removes 32 jelly beans. She places a distinctive mark on each bean and places it back in the jar. After thoroughly shaking the jar, she reaches in and removes 54 jelly beans of which 17 are marked. Using the techniques of capture-mark-recapture, estimate the number of jelly beans in the jar. Give Your answer rounded to the nearest whole number.

A math student is interested in counting the number of jelly beans in a jar. The student opens the jar and removes 45 jelly beans. She places a distinctive mark on each bean and places it back in the jar. After thoroughly shaking the jar, she reaches in and removes 30 jelly beans of which 5 are marked. Using the techniques of capture-mark-recapture, estimate the number of jelly beans in the jar. Give your answer rounded to the nearest whole number.

The local government in your town is interested in building a new youth recreation facility at taxpayers expense. The local government sends out surveys to every town resident who has at least one child Registered in the town school system. Of the 2567 questionnaires sent out, the paper receives 2485 Back, and most are in favor of the new facility. The data drawn from these surveys would most likely Suffer from

In order to approximate the average size of a perch in Lake Champlain, a biologist captures and analyzes 65 perch from 12 different regions of the lake. The researcher finds that on average, a perch is 23.6 cm in length from head to tail. Is the value of 23.6 cm a statistic or a parameter? Explain.

During a police line-up, the arresting police officer places the suspect under custody in a room with five other individuals. The arresting police officer then enters a room where a witness waits and opens a one-way window to reveal the lined-up individuals. The arresting officer then asks the witness to identify which of the individuals he or she recognizes as the perpetrator. This is an example of a blind situation, because the witness doesn't know which individual is the actual suspect. How could this situation be made double blind?

Every faculty member at Glasgow College is polled and it is found that 75% are in favor of requiring that all students must study abroad as part of the general education degree requirements. Is the result of 75% a statistic or a parameter? Explain.