Exam 1: Introduction to Statistics

Statistics is a discipline of data-based reasoning.

A ______ from a statistical population is the subset of measurements that are actually collected in the course of an investigation.

Statistics deals exclusively with displays of data and charts pertaining to different aspects of human activity.

Consider the population of all frequent flyers of an airline. You want to know the number of flights taken by a frequent flyer in a year. (a) Specify the population unit. (b) Specify the variable of interest. (c) Specify the statistical population.

Select the expression that best completes the following statement. "Once the decision to collect data to answer a question is made, we must develop a ______ that is both specific and unambiguous."

The vast collection of all potential observations that can be conceived in a given context is the population.

A college professor asked 35 students the day after the test, to estimate their test score using the scale from 0 to 100. (a) Specify the population unit. (b) Specify the statistical population. (c) Specify the sample.

Several months before a presidential election, a consulting firm asks about 2000 voters for their preferences. The final report helps to predict winners and track changes in voter preferences. The statement "track changes in voter preferences" corresponds to ______ statistics.

The data set that is actually acquired through the process of observations is the statistical population.

The two main branches of statistics are inferential and ______.

Determine whether the following is anecdotal or based on sample? Your twin neighbors think that the last Indiana Jones movie is the best.

After the data are collected, statistical methods used to summarize and describe the prominent features of data are known as ______.

The branch of statistics called experimental design can guide the investigator in planning the manner and extent of ______.

Statistics deals with collecting informative ______, interpreting these ______, and drawing ______ about a phenomenon under study.

To pursue potential improvements of a process, one needs to focus more closely on particulars. Three questions should always be asked before gathering further data. Which are these three questions?

The manager of a bookstore selects a group of customers that have read a specific author and gives them one of the author's books, asking them to complete a questionnaire after reading the book. Should the answers given by these customers considered a random sample?

Consider the population of all athletes in the last Olympic Games. You want to learn the total number of hours per week of training for an athlete. (a) Specify the population unit. (b) Specify the variable of interest. (c) Specify the statistical population.