Exam 1: Defining and Collecting Data

The universe or "totality of items or things" under consideration is called

The number of calories contained in a 12-ounce package of cheese will be measured on a ratio scale.

An insurance company evaluates many numerical variables about a person before deciding on an appropriate rate for automobile insurance.A person's age is an example of a _______ numerical variable.

If you randomly select a student from the first row of a business statistics class and then every other fifth student thereafter until you get a sample of 20 students, this is an example of a convenience sample.

To gather opinions on the efficacy of U.S.foreign policies, a sample of 50 faculty members is selected from the pool of university professors who have taught political science at the graduate level.This is an example of a judgment sample.

An insurance company evaluates many numerical variables about a person before deciding on an appropriate rate for automobile insurance.The number of claims a person has made in the last 3 years is an example of a _______ numerical variable.

A statistic is usually unobservable while a parameter is usually observable.

A continuous variable may take on any value within its relevant range even though the measurement device may not be precise enough to record it.

A summary measure that is computed to describe a characteristic from only a sample of the population is called

Which of the following sampling methods will more likely be susceptible to ethical violation when used to form conclusions about the entire population?

Researchers suspect that the average number of units earned per semester by college students is rising.A researcher at Calendula College wishes to estimate the number of units earned by students during the spring semester at Calendula.To do so, he randomly selects 100 student transcripts and records the number of units each student earned in the spring term.He found that the average number of semester units completed was 12.96 units per student.Identify the population of interest to the researcher.

The amount of alcohol consumed by a person per week is an example of a continuous variable.

Which of the following types of samples can you use if you want to make valid statistical inferences from a sample to a population?

In purchasing an automobile, there are several variables to consider.The color of the car is an example of a _______ variable.

A personal computer user survey was conducted.Primary word processing package used is an example of a _______ variable

Most colleges admit students based on their achievements in several different areas.The total SAT score achieved by a student is an example of a _______ numerical variable.

A study is under way in Yosemite National Forest to determine the adult height of American pine trees.Specifically, the study is attempting to determine what factors aid a tree in reaching heights greater than 60 feet tall.It is estimated that the forest contains 25,000 adult American pines.The study involves collecting heights from 250 randomly selected adult American pine trees and analyzing the results.Identify the population from which the study was sampled.

A sample is always a good representation of the target population.

The evening host of a dinner dance reached into a bowl, mixed all the tickets around, and selected the ticket to award the grand door prize.What sampling method was used?

A personal computer user survey was conducted.Hours of personal computer use per week is an example of a _______ numeric variable