Exam 1: Statistics, Data, and Statistical Thinking

A student completing a research project for a criminal justice class obtained a radar gun for determining automobile speeds and recorded the speeds of automobiles passing a fixed location Over a period of several hours. The student was unaware that the device needed to be recharged After two hours of use and that the speeds recorded after two hours were not reliable. What type of Problem has occurred?

An usher records the number of unoccupied seats in a movie theater during each viewing of a film. Identify the type of data collected.

Parking at a large university has become a very big problem. University administrators are interested in determining the average parking time (e.g. the time it takes a student to find a Parking spot)of its students. An administrator inconspicuously followed 250 students and Carefully recorded their parking times. Identify the variable of interest to the university Administration.

In an observational study, the researcher exerts strict control over the units in the study.

The process of using information from a sample to make generalizations about the larger population is called statistical inference.

The manager of a car dealership records the colors of automobiles on a used car lot. Identify the type of data collected.

Gender is one variable of interest in a study of the effectiveness of a new medication. For data entry purposes, the researcher conducting the study assigns 1 for Male and 2 for Female. Is the gender data quantitative or qualitative?

A researcher studying malnutrition among children in a developing country collected weights of a random sample of children using a scale that she had set to give weights 2.5 kilograms less than The actual weight. Which statement best describes this situation?

Explain why it is not necessary to provide a measure of reliability when a census is used rather than a sample.

A study in the state of Georgia was conducted to determine the percentage of all community college students who have taken at least one online class. 1500 community college students were Contacted and asked if they had taken at least one online class during their time at their Community college. These responses were then used to estimate the percentage of all community College students who have taken at least one online class. Identify the population of interest in this Study.

A census is feasible when the population of interest is small.

In an attempt to determine the ages of its customers, one store asked every tenth customer who entered the store his or her age. Identify the sampling design used.

In a survey of 2000 high school students, 14% of those surveyed read at least one best-seller each month. Give an example of a descriptive statement and an inferential statement that could be made based on this information.

A quality inspector tested 41 copiers in an attempt to estimate the average failure rate of the copier model. His study indicated that the number of failures decreased from two years ago, indicating an increase in the reliability of the copiers. Describe the variable of interest to the inspector.

Parking at a large university has become a very big problem. University administrators are interested in determining the average parking time (e.g. the time it takes a student to find a Parking spot)of its students. An administrator inconspicuously followed 250 students and Carefully recorded their parking times. What type of variable is the administration interested in Collecting?

Give an example of unethical statistical practice.

Parking at a large university has become a very big problem. University administrators are interested in determining the average parking time (e.g. the time it takes a student to find a Parking spot)of its students. An administrator inconspicuously followed 250 students and Carefully recorded their parking times. Identify the population of interest to the university Administration.

What term is used to describe the situation where sampling units contained in a sample do not produce sample observations?

Parking at a large university has become a very big problem. University administrators are interested in determining the average parking time (e.g. the time it takes a student to find a Parking spot)of its students. An administrator inconspicuously followed 250 students and Carefully recorded their parking times. Identify the experimental unit of interest to the university Administration.

Parking at a large university has become a very big problem. University administrators are interested in determining the average parking time (e.g. the time it takes a student to find a Parking spot)of its students. An administrator inconspicuously followed 250 students and Carefully recorded their parking times. The university is interested in using the information from The sample of 250 students collected to learn information about the entire student parking Population. Would this be an application of descriptive or inferential statistics?