Math 105 Exam review questions and answers 100% verified.

Identify Population: 1500 american women working for large companies were polled to determine the percentage that felt that women were under represented in management positions in their company - correct answers All american women working for large companies Identitfy Population parameter: 1500 american women working for large companies were polled to determine the percentage that felt that women were under represented in management positions in their company - correct answers percentage who feel that women are under represented Identify Sample Statistic: 1500 american women working for large companies were polled to determine the percentage that felt that women were under represented in management positions in their company - correct answers percentage of women in the sample who feel that women are under represented Sampling: A sample consists of every 20th student who leaves the library - correct answers Systematic sampling study: Does smoking elevate blood pressure? - correct answers Case-control study Study: How do lawyers salaries compare to doctors salaries? - correct answers Observational study Sampling: To avoid working late, a quality control analyst simply inspects the first 100 items produced in a day. - correct answers convenience Sampling: a pollster uses a computer to generate 500 random numbers, then interviews the voters corresponding to those numbers. - correct answers simple random Sampling: 49 students are selected at random from the sophomore class, 39 from the junior class, and 48 from the senior class - correct answers stratified Study: does an hour of meditation per day lower blood pressure? - correct answers Experiment without blinding Study: Does the new medication relieve depression? - correct answers Experiment with double blinding A poll conducted the day before the student-body presidential election at midwestern university showed that 53.0 percent favored Mario, the rest favoring Yin ling. Tha margin of error was 5.0 percentage points. Should Yin Ling have conceeded the election? - correct answers no; 48% to 58% Study: does caffeine cause birth defects? - correct answers Case-control study Following the national republican convention, a poll of boters in cental illinois community showed that 58.1% would choose the republican ticket to win over the democrat ticket no matter whom the democats chose for vice-president. the margin of error was 4.2 percentage points. Should the democrats expect to lose central illinois? - correct answers 53.9% to 62.3%; yes Which of the following describes a study in which neighter the participants nor the experimenters know which participants are in the control group? - correct answers double-blind experiment which of the following describes a study in which the participants naturally form groups by choice? - correct answers case-control study Which of the following describes a study in which the researchers do not attempt to change the characteristics of those being studied? - correct answers observational study Double blinding is used in an experiment t avoid which of the following problems? - correct answers If an experimenter knows whether the patient has received the treatment or the placebo, this may influence how he or she questions the patient. a poll is taken of likely voters the day before the mayoral election in the town of ingleside. the poll reveals that 54% of voters plan to vote for Anne Sanchez. The margin of error is 3.9 percentage points. Which of the following statements best describes Anne Snchez's chance of winning? - correct answers She is very likely to win. In a study to determine the most popular automobile on the road, which of the following is the most representative sample? - correct answers A random smample of cars driving on the highway. In a study to determine the average weight of a house cat which of the following si the most representative sample? - correct answers Some of the cats in each of several neighborhoods Flaw: A pharmaceutical company conducted a study to test the effectiveness of its new anti-depression medication. 500 adults suffering from depression were selected at random and were randomly assigned to either a treatment group or a placebo group. The experiment was double blind. The results were analyzed by the company. - correct answers the source of the study Flaw: A researcher randomly selected 500 college students and asked "How many IQ points would you sacrifice to become better looking?" The following conclusion was published in the student newspaper "Students would sacrifice 18 IQ points to become better looking." - correct answers Variables are hard to define/measure Flaw: A high school principal wanted to know how the teachers at her school felt about early dismissal for homecoming. She put the names of the 114 faculty in a hat and randomly selected 30 of the names. She gave questionnaires to those 30 people asking whether they agreed or disagreed with the following statement: "Valuable learning time should not be sacrificed for extracurricular social activities." The questionnaries were filled out anonymously. Her conclusion was that 80% of the faculty were opposed to early dismissal for homecoming. - correct answers the wording of the question Flaw: a film critic is interested in knowing which is the most popular film of theyaer amoungst americans. to answer this question he conducts a telephone poll in the new york metropolitan area and asks each person to name their favorite film of the year. - correct answers Selection bias Flaw: a medical researcher randomly selects 500 hapanese people and 500 americans. She questions the 1000 people. she finds that the americans work longer hours on average and also that the americans hav a higher rate of heart disease. She concludes that working longer hours is associated with a higher incidence of heart disease. - correct answers confounding variables Flaw: "38% of adults in the United States regularly visit a doctor." This conclusion was reached by a college student after she had questioned 520 randomly selected members of her college. What is wrong with her survey? - correct answers selection bias A reseracher published this survey result: "74% of poeple woul be willing to spend 10 percent more for energy from a non-polluting source." The survey question was announced on a national radio show and