Exam 1: Defining and Collecting Data

True or False: A sample is always a good representation of the target population.

TABLE 1-2 A Wall Street Journal poll asked 2,150 adults in the United States a series of questions to find out their view on the U.S.economy. -Referring to Table 1-2,the possible responses to the question "What do you think is the current number of people unemployed in the country?" are values from a

TABLE 1-1 The manager of the customer service division of a major consumer electronics company is interested in determining whether the customers who have purchased a Blu-ray player made by the company over the past 12 months are satisfied with their products. -Referring to Table 1-1,the possible responses to the question "How would you rate the quality of your purchase experience with 1 = excellent,2 = good,3 = decent,4 = poor,5 = terrible?" are values from a

Most colleges admit students based on their achievements in a number of different areas.The grade obtained in senior level English (A,B,C,D,or F)is an example of a ________ variable.

TABLE 1-1 The manager of the customer service division of a major consumer electronics company is interested in determining whether the customers who have purchased a Blu-ray player made by the company over the past 12 months are satisfied with their products. -Referring to Table 1-1,the possible responses to the question "How would you rate the quality of your purchase experience with 1 = excellent,2 = good,3 = decent,4 = poor,5 = terrible?" result in

True or False: The quality ("terrible," "poor," "fair","acceptable," "very good," and "excellent")of a day care center is an example of a numerical variable.

True or False: When participants are allowed to self-select into the sample,you have a nonprobability sample.

Which of the following is a discrete quantitative (numerical)variable?

True or False: If a simple random sample is chosen with replacement,each individual has the same chance of selection on every selection.

True or False: When dealing with human surveys,we are usually interested in sampling with replacement.

Most analysts focus on the cost of tuition as the way to measure the cost of a college education.But incidentals,such as textbook costs,are rarely considered.A researcher at Drummand University wishes to estimate the textbook costs of first-year students at Drummand.To do so,she monitored the textbook cost of 250 first-year students and found that their average textbook cost was $600 per semester.Identify the sample in the study.

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.

True or False: The only reliable way a researcher can make statistical inferences from a sample to a population is to use nonprobability sampling methods.

Which of the following is most likely a population as opposed to a sample?

A telemarketer set the company's computerized dialing system to contact every 25th person listed in the local telephone directory.What sampling method was used?

A sample of 300 subscribers to a particular magazine is selected from a population frame of 9,000 subscribers.If,upon examining the data,it is determined that no subscriber had been selected in the sample more than once,

TABLE 1-2 A Wall Street Journal poll asked 2,150 adults in the United States a series of questions to find out their view on the U.S.economy. -Referring to Table 1-2,the possible responses to the question "How would you rate the condition of the U.S.economy with 1 = excellent,2 = good,3 = decent,4 = poor,5 = terrible?" are values from a

TABLE 1-1 The manager of the customer service division of a major consumer electronics company is interested in determining whether the customers who have purchased a Blu-ray player made by the company over the past 12 months are satisfied with their products. -Referring to Table 1-1,the possible responses to the question "What brand of Blu-ray player did you purchase?" result in

The Dean of Students conducted a survey on campus.SAT score in mathematics is an example of a ________ numerical variable.

To obtain a sample of 10 books in the store,the manager walked to the first shelf next to the cash register to pick the first 10 books on that shelf.This is an example of a