Exam 1: Data Collection

The city council of a small town needs to determine if the townʹs residents will support the building of a newlibrary. The council decides to conduct a survey of a sample of the townʹs residents. Which one of the followingprocedures would be most appropriate for obtaining a sample of the townʹs residents?

A bicycle manufacturer produces four different bicycle models. Information is summarized in the table below: Model Series Number Weight Style Ascension A120 33 Mountain Road Runner B640 21 Road All Terrain C300 27 Hybrid Class Above D90 17 Racing Identify the variables and determine whether each variable is quantitative or qualitative.

Classify the variable as qualitative or quantitative. -the number of calls received at a companyʹs help desk

Classify the variable as qualitative or quantitative. -the native languages of students in an English class

True or False: Observational studies are not as useful as experiments to learn about the characteristics of apopulation.

Identify the type of sampling used. -A writer for an art magazine randomly selects and interviews fifty male and fifty female artists. What samplingtechnique is used?

Classify the variable as qualitative or quantitative. -the number of seats in a school auditorium

Determine whether the quantitative variable is discrete or continuous. -the low temperature in degrees Fahrenheit on January 1st in Cheyenne, Wyoming

Determine the level of measurement of the variable. -capacity of a backpack

The variable measured in the experiment is called ____________ .

Identify the type of sampling used. -A lobbyist for the oil industry assigns a number to each senator and then uses a computer to randomlygenerate ten numbers. The lobbyist contacts the senators corresponding to these numbers. What samplingtechnique was used?

Determine what type of observational study is described. Explain. -Can money buy happiness? A researcher wanted to determine whether there was any association betweeneconomic status and happiness. She selected a sample of 1000 adults and interviewed them. Each person wasasked about their financial situation and their level of happiness was evaluated. The researcher analyzed theresults to determine whether there was an association between economic status and happiness.

Determine whether the study depicts an observational study or an experiment -A pollster obtains a sample of students and asks them how they will vote on an upcoming referendum.

The government of a town needs to determine if the cityʹs residents will support the construction of a newtown hall. The government decides to conduct a survey of a sample of the cityʹs residents. Which one of thefollowing procedures would be most appropriate for obtaining a sample of the townʹs residents?

Determine whether the underlined value is a parameter or a statistic. -Telephone interviews of 372 employees of a large electronics company found that 65% were dissatisfied withtheir working conditions.

Determine whether the underlined value is a parameter or a statistic. -The average age of the 65 students in Ms. Hopeʹs political science class is 21 years 7 months.

A medical journal published the results of an experiment on anxiety. The experiment investigated the effects ofa controversial new therapy for anxiety. Researchers measured the anxiety levels of 65 adult women who suffermoderate conditions of the disorder. After the therapy, the researchers again measured the womenʹs anxietylevels. The differences between the the pre- and post-therapy anxiety levels were reported. How many levelsdoes the treatment have in this experiment?

Determine whether the quantitative variable is discrete or continuous. -The number of violent crimes committed in a city on a given day in a random sample of 110 days is a__________ random variable.

A manufacturer of cellular phones has decided that an assembly line is operating satisfactorily if less than 0.05% of the phones produced per day are defective. To check the quality of a dayʹs production, the companydecides to randomly Sample 10 phones from a dayʹs production to test for defects. Define the population ofinterest to the manufacturer.

Classify the variable as qualitative or quantitative. -the numbers on the shirts of a boyʹs football team