Exam 1: Collecting Data

Use the following State whether the data are best described as a population or a sample. -A football fan recorded the number of rushing yards for all NFL running backs who played last season.

Use the following A high school senior is collecting data on the colleges in which she is interested. Identify the variables as either categorical or quantitative. -Zip Code: the zip code of the part of the country in which the college is located

Use the following to answer questions : Can people text just as quickly with their off hand as they do their dominant hand? Assume that you have 42 volunteers available to participate in your study, and that the response you will measure is the time it takes to type and send a text message. -Design a randomized comparative experiment to investigate this question. Be specific about how randomization will be used in your experiment.

Use the following The USStates dataset, used throughout the textbook, contains information on the 50 U.S. states from 2008. A small segment from the dataset is displayed in the following table. -Data from the state of Connecticut were used to determine that 43.4% of state residents had a college degree. What were the cases from Connecticut used to arrive at this figure?

Use the following A high school senior is collecting data on the colleges in which she is interested. Identify the variables as either categorical or quantitative. -Graduation Rate: as a percentage

Use the following Identify whether each of the following scenarios describe a randomized comparative experiment or a matched pairs experiment. -To study the effect of classical music on concentration, 26 math majors were assigned at random into two groups. Subjects in one group listened to classical music while trying to solve a hard Sudoku puzzle, while the subjects in the other group solved the same puzzle in a silent room. The time it took each student to finish was recorded.

Use the following to answer questions : The Admissions Office at a small university has developed a new 10-minute video about the university to send to prospective students. Before mass-producing the DVD, they would like to test whether it is more effective than the current video. Suppose that you have 12 high school student volunteers who have agreed to take part in an experiment. The explanatory variable to be studied is the type of video, with two levels OLD and NEW. -Explain what it means, in the context of this study, to want the subjects to be "blind."

Use the following to answer questions : The Admissions Office at a small university has developed a new 10-minute video about the university to send to prospective students. Before mass-producing the DVD, they would like to test whether it is more effective than the current video. Suppose that you have 12 high school student volunteers who have agreed to take part in an experiment. The explanatory variable to be studied is the type of video, with two levels OLD and NEW. -What specific question would you ask the students to measure as the response variable in this study?

What are the cases in the realtor's dataset?

Use the following A high school senior is collecting data on the colleges in which she is interested. Identify the variables as either categorical or quantitative. -Type of college: Private or Public college

Use the following State whether the data are best described as a population or a sample. -A researcher has identified a beach with a substantial number of driftwood logs. She randomly chooses 30 logs and takes core samples from those logs.

Use the following A high school senior is collecting data on the colleges in which she is interested. Identify the variables as either categorical or quantitative. -Enrollment: the number of students enrolled at the college

Use the following A group of researchers investigated the effect of media usage (whether or not subjects watch television or use the Internet) in the bedroom on "Tiredness" during the day (measured on a 50 point scale). -Suppose that the researchers found that the individuals who use media in the bedroom tended to be more tired during the day than those who do not. Would it be appropriate for the researchers to conclude that using media in the bedroom causes tiredness during the day? Briefly explain why or why not.

Use the following In each situation, indicate whether the method of data collection is biased. If it is, briefly explain why. -A professor asks her class of first year students if any of them consumed alcohol over the weekend.

Refer to the variables provided by the realtor. Identify a question we might ask about any one of these individual variables.

Use the following A high school senior is collecting data on the colleges in which she is interested. Identify the variables as either categorical or quantitative. -State: the state in which the college is located

Association implies causation.

Use the following A 2012 study investigated the impact of psychological stress on men's judgements of female body size. The men were randomly assigned to one of two groups; one group was assigned to participate in a stressful task while the other group did not take part in the task. Then the men were asked to rate the attractiveness of female bodies varying in size from emaciated to obese. -Identify the response variable in this experiment.

A biased sample is one that does not accurately reflect or represent the population.

Use the following to A realtor's website provides information on area homes that are for sale. Identify each of the variables as either categorical or quantitative. -List Price: amount, in thousands of dollars, for which the house is being sold